How do i contact great american insurance group customer service? Customer Service: 800-545-4269. [email protected]. Great American Insurance Group. P.O. Box 5425. Cincinnati, OH 45201-5425. Overnight Address. Great American Insurance Group Tower. Property & Casualty Group. 301 E Fourth Street. Where can i find the american advisors group? American Advisors Group - Irvine, CA. 18200 Von Karman Avenue 9th, 10th and 11th Floor. Irvine, CA 92612. 1-866-948-0003 What is the address for great american life insurance company? Great American Life Insurance Company. P.O. Box 5420. Cincinnati, OH 45201-5420. 800-854-3649. Monday – Friday 8 a.m.- 5 p.m. ET.How do i contact american funds customer service? Find the mailing address for your region of the country. Help with client accounts. Manage existing accounts. American Funds Service Company®. (800) 421-0180 — option 1. Help is available 8:00 a.m. to 7:00 p.m. EST, Monday through Friday. Self-service resources. Use our online resources anytime. Service Center.