Last updated on December 16th, 2019 at 09:44 amHow to make a Complaint to Carl’s Jr. In the first instance, you should contact Carl’s Jr. by phone on 877-799-STAR 7827 (Mon. – Fri. 5:00 a.m. – 11:00 p.m. Central). The Carl’s Jr. have a structured complaints procedure if an initial phone call does not resolve your issue,