Clearly state the decision regarding the refund. Over Payment Refund Letter To Customers Template.Customer Request for Refund. We have identified the following overpayment and are in good faith voluntarily refunding all monies collected in error. The name and ID number of the Member for whom we have overpaid. The dates of service. A letter will be sent to the taxpayer advising as to which field office the refund claim was assigned and how to contact the manager of the assigned office. Refund Letter Format: Requesting someone for the refund of your amount paid? Then, complete the Application for Property Tax Refund for a refund of your overpayment.