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.Palmetto GBA is pleased to offer secure and fast delivery of overpayment demand letters through our eServices selfservice internet portal. Write a letter to the Social Security Administration. Tell them how much you can afford to pay each month. 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. 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. Please call 1-800-772-1772 or your local field office and we may be able to process your waiver request quickly over the phone. The Virginia Employment Commission (VEC) has provided a statement of billing for the overpayment(s).