Just call 555-5555 and our customer service representative will honor your request. Our document template is designed to make the process of writing an "Inform a Customer of an Overpayment" letter quick, easy, and stress-free.For ACTIVE faculty, staff and students for an overpayment in the Current Calendar Year. Say when and how you expect to be paid if there is money involved (such as a payment plan). Do you want a check or just cash? This memorandum serves as notification of an overpayment of wages that you received and the subsequent repayment that is your responsibility.