[Your Address]
[Your Postcode]
[Debt Buyer Registered Company Address (look on Companies House)]
[Debt Buyer Postcode]
[date]
Dear Sir/Madam,
Your reference number:
It has come to my attention that you have received payment for the above account number, which it is now apparent was not owed to your company due to the following reasons:
It is now apparent that requests for payments on this account were misrepresentations designed to obtain monies by deception.
You are formally requested to close this account and refund any and all payments received.
Failure to close the account and issue a Full Refund may result in Legal Action being taken against your company to recover the money through the Civil Court. Your company may also be reported for Criminal offences relating to obtaining money by deception in breach of the Fraud Act 2006.
Regards,
[Your name]