Your letter must include your name, address, Social Security number, and why you disagree with the determination. Select Benefit Overpayment Services.Select Make a Payment. 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. When we notify you of an overpayment you can make arrangements for repayment, appeal the decision, or request a waiver. When you overpay your credit card, extra funds generally remain as a credit on your account. But there are more options you may consider. Write a letter to the Social Security Administration. Tell them how much you can afford to pay each month.