Home > Contact Get the help you need Call us at 866-GAINSCO Mailing Address GAINSCO Auto Insurance P.O. Box 869153 Plano, TX 75086 Bilingual GAINSCO representatives are standing by to assist you Customer Service Need assistance? Call us at866-GAINSCO(866-424-6726).Monday-Friday,8 AM – 6 PM CST Claims Call us to report a claim or submit and manage claims online 24/7 Make a payment Make an online payment right now or call us to make one over the phone