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How to quickly draft a formal letter disputing an incorrect billing charge Illustration

How to quickly draft a formal letter disputing an incorrect billing charge

Written by Nikhil Badjatya
Direct Summary:

Under the Fair Credit Billing Act (FCBA), you have a strict 60-day window from the date the statement containing the error was mailed to send a written dispute — a phone call alone doesn't count. An AI assistant can draft the letter itself in seconds using the FTC's own suggested structure ("I am writing to dispute a charge of $[amount] to my account on [date]. The charge is in error because [reason]."), but you still need to send it to the card issuer's specific dispute address (not the payment address) and keep proof of delivery, since the law's protections depend on that timely, written, verifiable dispute.

"Any sufficiently advanced technology is indistinguishable from magic."

— Arthur C. Clarke

Key Insights

  • The 60-day window is strict and starts from the statement date: the FCBA requires your written dispute be sent within 60 days of the statement containing the error being mailed — draft and send promptly rather than waiting.
  • It must be written — a phone call alone doesn't trigger FCBA protections: call the issuer if you want, but follow up with an actual written letter to the designated dispute address.
  • Send it to the dispute address, not the payment address: these are commonly different addresses on the same statement — check your statement, the issuer's website, or your card agreement for the correct one.

An AI assistant is genuinely useful here because a billing dispute letter has a known, simple structure — state the charge, state why it's wrong, request the resolution — and drafting that structure quickly is exactly what a chat assistant does well. The part that actually matters for your legal protection isn't the writing quality; it's getting the letter sent, in writing, to the right address, within the 60-day window the Fair Credit Billing Act sets.

Drafting and sending an effective dispute letter

1. Give the assistant the specific facts: charge amount, date, and why it's wrong. A prompt like "draft a formal letter disputing a $47.99 charge on [date] that I never authorized" produces a letter using the same structure the FTC itself suggests.

2. Attach or reference your supporting evidence. Mention receipts, shipping confirmations, or prior correspondence in the letter, and actually include copies (not originals) when you send it.

3. Send it in writing to the correct dispute address, within 60 days, and keep proof of delivery. Certified mail with a return receipt gives you documented proof the issuer received it — important if the dispute later needs escalation.

dispute_letter_prompt.md 
# A concrete prompt for a billing dispute letter

Draft a formal letter disputing a charge of $47.99 to my
[card issuer] account, dated March 3, 2026. The charge is
in error because I canceled this subscription in January
and have a cancellation confirmation email. Use the
standard structure: state the charge, state why it's
wrong, request removal of the charge and confirmation
in writing. Keep it under one page.
Dispute Method Triggers FCBA Protections?
Phone call only No — must be followed by a written dispute
Written letter sent within 60 days to the dispute address Yes — triggers the issuer's 30-day acknowledgment and 90-day investigation obligations

The AI-drafted letter is the easy part; the legally load-bearing part is procedural — timely, written, correctly addressed, with proof of delivery. Treat the draft as a starting point that still needs those procedural details filled in correctly before it's sent.

Practical Challenge

Use the prompt template above to draft a dispute letter for a real or hypothetical incorrect charge, then find your card issuer's actual billing-dispute mailing address on a recent statement.

Concept Check

Under the Fair Credit Billing Act, what's required for a billing dispute to trigger the issuer's investigation obligations?
Correct! The FCBA specifically requires a written dispute within the 60-day window, sent to the correct address — a phone call alone doesn't meet the legal requirement.
Incorrect. Try again! The dispute goes to the card issuer first (via their designated dispute address), and it must be written and timely — a call alone isn't sufficient.

Sources & Further Reading

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