It is the responsibility of the DPR to notify and review the overpayment letter with the employee. Write a letter to the Social Security Administration.Tell them how much you can afford to pay each month. The Benefit Recovery Unit reviews the case and establishes a claim if an overpayment has indeed occurred. Mail a letter or complete and send in an Information. Request Form (FR-9). An overpayment happens when the Social Security Administration (SSA) thinks it has paid you more than it should have. An overpayment can happen if there is an ineligibility notice, which disqualifies a claimant in certain cases where they have already received benefits.