A letter to a robocaller won't clear your voicemail overnight. So why send one at all? You still get a dated record that you told the caller to stop, and the FCC or FTC can use that record if you later file a complaint.

Turns out, the paper trail matters more than the stationery.

What a robocall letter can and cannot do

The Telephone Consumer Protection Act, the FCC's call rules, and the FTC's Do Not Call program are the U.S. rules that actually govern these calls. Home telemarketing calls are banned before 8 a.m. That limit is in the FCC's guide to stopping unwanted robocalls and texts.

Prerecorded telemarketing messages must offer an opt-out at the start. You can still get plenty of other unwanted calls. The FTC's Do Not Call Registry lets you opt out of many legal telemarketing calls, but it does not stop every category of robocall that hits a phone. It misses whole groups of calls.

A letter proves you asked them to quit and gives regulators a timeline if you escalate. It won't make a hidden overseas scammer obey, so you still need carrier blocking and complaints to the agencies.

The rules that matter, in plain English

Register your number first. The TCPA is the federal statute that fuels a lot of robocall lawsuits, and the FCC's rule at 47 CFR 64.1200 sets the delivery restrictions that sit next to it. The FTC runs the National Do Not Call Registry.

It takes reports about DNC violations. The FTC's Do Not Call Registry FAQs say you can register up to three numbers at a time online.

Open each email and click the link within 72 hours.

As of September 30, 2025, the FTC's 2025 Do Not Call Registry Data Book put active registrations at about 258.5 million. Your FCC complaint may be shared with other enforcement agencies. That is in the FCC guide. One well-documented complaint can move through more than one office.

Before you send anything, collect the basics

If you wait until the weekend to reconstruct the week, you'll swear the Wednesday call was Thursday and you'll lose the wording of the recording, so grab the number, the time, and a screenshot while the missed-call banner is still sitting there.

You'll need two piles of notes. One pile is your number, DNC status, and registration date. The other is the caller's number, each date and time, and what the message said.

Don't write from memory. Keep screenshots, call logs, voicemails, and any opt-out you already made with those notes. Regulators can work from patterns without a company name. If you don't know the company's legal name, say that in the letter. Use the number plus a short description instead.

Sample letter 1: Cease-and-desist and opt-out

Use this if you have a phone number, a company name, or a mailing address. Email works when you have a real address. Certified mail gives you proof of delivery.

[Your Name]
[Your Address]
[City, State ZIP]
[Date]

[Caller or Company Name]
[Address or phone number used]

Subject: Cease and desist and opt-out request for [your phone number]

To whom it may concern:

I am the subscriber and regular user of [your phone number]. I do not consent to receive autodialed, prerecorded, or telemarketing calls from your company.

Stop calling [your phone number] immediately. Remove my number from all calling lists. Do not sell, share, or transfer my number for calling purposes.

I received these calls:
[Date, time, caller number, and what the message said]

I am registered on the National Do Not Call Registry. I am keeping a log of every call. If the calls continue, I may file complaints with the FCC and FTC and consider any legal options available under the Telephone Consumer Protection Act.

Send written confirmation that my number has been removed.

Sincerely,
[Your Name]

Sample letter 2: FCC informal complaint narrative

No lawyer is required here, and the FCC wants the complaint filed online at its Filing an Informal Complaint page.

Use the text below as your narrative. Attach or paste your call log.

Subject: Illegal robocalls to [your phone number]

I am filing an informal complaint about repeated robocalls from [number or company].

My number: [your phone number]
Do Not Call registration date: [date]
Call log:
[Date, time, caller number, and message]

These calls were made without my consent. They appear to violate the TCPA and FCC rules. Please investigate and share this complaint with the appropriate enforcement office.

[Your Name]
[Phone or email]

Sample letter 3: FTC and Do Not Call complaint

The FTC does not resolve individual complaints like a court. It uses reports to spot patterns and build cases, so a single filing can still help them connect dots. Go ahead and file it anyway.

Subject: Do Not Call violation by [caller number or company]

I am registered on the National Do Not Call Registry. I have received these unwanted calls:
[Date, time, caller number, and message]

I did not give consent to these calls. Please add this report to your enforcement records.

[Your Name]
[Phone or email]

Sample letter 4: Carrier blocking request

Verizon, AT&T, and T-Mobile all offer call-blocking or filtering tools. The FTC's January 2026 report to Congress says major voice providers now offer these products.

Features and prices vary by plan, so check your account first. Send this through your carrier's app, chat, or support form, not a random email address.

Subject: Request to block persistent robocalls on [phone number]

Account holder: [name]
Account number: [number]
Phone number affected: [number]

I am receiving repeated unwanted calls from these numbers:
[Date, time, caller number, and description]

Please turn on the strongest spam-blocking and call-filtering features available for my line. I have already registered on the National Do Not Call Registry and filed complaints where appropriate.

Send confirmation of the blocking settings that are active on my account.

[Your Name]

Sample letter 5: TCPA demand letter

This is the firmest letter. To be honest, it's also the one most likely to get ignored if your log is thin. Use it after you have dates, times, numbers, and a clear record.

It is not legal advice.

Subject: Demand to stop calls and preserve records - [phone number]

I have received [number] calls from [company or number] to [phone number] without my consent. The calls are listed below.

[Call log: date, time, number, and message]

This letter is a demand that you stop all calls to my number and preserve records related to these calls, including call logs, consent records, and dialing records.

If you want to resolve this matter, contact me in writing within 14 days. I am also reviewing my options under the Telephone Consumer Protection Act.

Sincerely,
[Your Name]

Where to send each one

Match the document to the inbox.

What you should expect after you send

Thing is, enforcement takes time. The FTC says telemarketers who made illegal calls have paid more than $290 million in judgments. That money came from cases, not from a quick complaint form.

The FCC may review your complaint, share it with other agencies, or forward it to your provider. It won't send you a check. An FTC report can feed an enforcement pattern. The agency will not act as your personal lawyer.

Carrier filters cut some calls and miss others, and they mislabel a few that were actually fine, which is annoying. The DNC Registry reduces many telemarketing calls. It still leaves whole categories untouched.

TCPA personal damages are a different track. You may need to talk with a consumer lawyer or consider small claims where allowed. 47 U.S.C. 227 allows $500 per violation. A court may increase that to $1,500 for willful or knowing violations.

Keep the records until the calls stop. Keep them until any complaint is closed, too.

FAQ

Do I need a lawyer to send these letters?

A cease-and-desist or an FCC or FTC complaint doesn't require one. Talk to a consumer lawyer if you're heading toward a lawsuit or a settlement demand.

Can I send the same letter to every agency?

Customize each one. The FCC is looking at communications law. The FTC is looking at Do Not Call and deceptive practices.

What if the caller blocks caller ID or uses a fake number?

Report the number you saw, the time, and a short description anyway, to both the FCC and the FTC. Your carrier may see network-level patterns you can't.

Will a letter stop all robocalls?

No. It can stop one caller and build a record, and you'll still want carrier blocking plus some caution about where you give out your number.

Build the call log first. Send the cease-and-desist to the caller and file the FCC complaint on the same day so the dates line up if the calls continue.