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State the error in one sentence, then give the account details, the transaction dates and amounts, and what the correct figure should be. Send it promptly, keep a copy and the delivery record, and do not include your full account number or password in the letter. A written error notice starts a formal clock at most banks, which is why paper beats a phone call here.
In the United States, the Electronic Fund Transfer Act gives you a set window, measured from the statement date, to report an electronic transfer error in writing, and the bank then has its own deadline to investigate. In Canada, banks follow their own complaint procedures and the codes of conduct that govern them, and a written notice still creates the dated record that a later complaint or ombudsman review will ask for. Either way, the date on your letter is doing real work: it proves you reported the problem on time. That is the single biggest reason to put an error in writing instead of trusting a call-centre note.
Speed matters for another reason. The longer an error sits, the harder it gets to unwind: later transactions pile on top of it, fees compound, and the bank's records for the original transaction may age out of easy reach. Write the letter as soon as you spot the problem, even if you are still waiting for a document or two. You can always send a short follow-up with the extra detail.
Keep it to one page if you can. Banks route error letters through a processing team, and a short letter with the facts in order gets handled faster than a long story. Include the items in the table, and attach a copy of the statement page with the error circled, not the whole statement.
| Item | What to write |
|---|---|
| Your identification | Full name, mailing address, and phone number, so the bank can reach you |
| Account identification | Account type and the last four digits only, never the full number |
| The error, in one sentence | For example: a deposit of a stated amount posted twice, or a withdrawal you did not make |
| Transaction details | Date, amount, and description exactly as shown on the statement |
| What should be true | The correct amount or the fact that the transaction should not exist |
| What you want | Correction of the balance, reversal of the charge, or refund of related fees |
| Enclosures | Copy of the statement page, and any receipt or confirmation you hold |
Never put your full account number, debit card number, online banking password, or PIN in a letter. A letter passes through many hands and machines, and the bank does not need those details to find your account: your name, address, and the last four digits are enough. For the same reason, do not enclose original documents. If the bank needs an original, it will ask for it, and you will still have it.
Use the error-reporting address in your account agreement or on the back of your statement, not the address of your local branch, unless the agreement says otherwise. Large banks route mail by department, and a letter sent to the wrong address can sit for weeks before anyone forwards it. Send it by Certified Mail in the US or Registered Mail in Canada so you hold proof of the mailing date, and keep a copy of the letter, the mailing receipt, and the delivery record together. If the bank's reply is slow or unsatisfactory, that file is what you hand to the regulator or ombudsman next.
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