Clearly state the decision regarding the refund. Over Payment Refund Letter To Customers Template.In this article, we'll show you how to write a refund request letter template that not only grabs attention but also persuades companies to act in your favor. Enter the details in the fields using the same info from the original sale. This brief but important letter notifies a customer that he or she has overpaid you. It can serve as a very good customer relations letter. Refund Letter Format: Requesting someone for the refund of your amount paid? Overview: This IRM provides procedural and processing instructions to the Accounting Operations to approve, schedule, and certify refunds. Now, here's how you can zero out the opening balance of your customer receiving the refund: Go to the Plus icon.