Your letter must include your name, address, Social Security number, and why you disagree with the determination. Select Benefit Overpayment Services.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. In the letter, provide the date that the Notice of Overpayment was sent to you. Your overpayment can only be waived for certain types of overpayments in addition to your income. No one here will be able to answer that for you.