Enter 'Social Security' in the search box. Click on "Continue" under the Repay Your Social Security Overpayment Online section.Repay your Social Security Overpayment Online. The Social Security office phone number is (800) 772-1213. The hours of operation are Monday through Friday am to pm. Using your bank's online bill pay feature, to make a payment to "Social Security Administration. " • Send us a check for the entire amount of the overpayment. Fill out a Request for Change in Overpayment Recovery Rate. This form is attached. The Bexar County Tax Assessor-Collector's Office is the only County in the State of Texas with a 10-month payment plan.