Over Payment Refund Letter To Customers Template. Clearly state the decision regarding the refund.This refund represents the resolution of a disputed claim. Dear Customer: Enclosed with this letter you will find a refund check from Minnesota Energy Resources. Form TR210 is a letter you receive if: If you received it, you may be entitled to a refund for the tax year stated on the letter. Refund Letter Format: Requesting someone for the refund of your amount paid? We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error.