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.Providers have the option to submit a Request For Extended Repayment Schedule (ERS). A complete ERS request should be submitted immediately. The salary overpayment resulted because . You have to tell your credit or debit card company about any error you're disputing within 60 days of when the first statement with the charge was sent to you. Write a letter to the Social Security Administration. Tell them how much you can afford to pay each month. It's just an extra step we're taking to verify the returns we process and make sure refunds go to the right person. If we have identified an overpayment and request a refund, please mail the check along with a copy of the overpayment request letter we sent you.