ACS Lender Customer Service Numbers Home» ACS» ACS Lender Customer Service: +1 (800) 835-4611 FFEL TTD / TTY Relay Services: 711 FFEL Collections Department: +1 (800) 784-5309 Billing Statement: +1 (800) 826-4470 Corporate Address: ACS P.O. Box 7051 Utica, NY 13504-7051ACS Education Services is the luminous and dominant affiliation that renders extraordinary care service including remittance amenities for academy pertained credits, loans facility, private study credit policies, and introducing Federal Family Education Loan Program. ACS Lender laying utmost emphasis to furnish Customer Care Representatives to sought out their concern via phone and reassure remit.