Enter 'Social Security' in the search box. To appeal, use SSA Form 561, Request for Reconsideration.You must appeal within 60 days of the day you got the notice. 820 Concourse Village West, Second Floor, Bronx, NY 10451; 123 William Street, Third Floor, New York, NY 10038. Repay your Social Security Overpayment Online. What is an overpayment?