Repay your Social Security Overpayment Online. Negotiate a payment plan.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. A program to help you fill out the forms to ask the court to waive or reduce filing fees for an appeal. Enter 'Social Security' in the search box. The overpayment letter asks for the money to be returned within 30 days, but Social Security will work out a monthly payment plan with you if you ask.