Complaints regarding any type of insurance in TN need to be filed the TN Department of Consumer Insurance Services. You could contact them by phone at 615-741-2218. They will listen to your complaint, but ultimately will direct you to their special online form found on the state's website. You can bypass the tedious process of drilling down through the state's website and find the online form to complete at the following link:-
https://sbs-tn.naic.org/Lion-Web/servlet/org.naic.sbs.ext.onlineComplaint.OnlineComplaintCtrl?spanishVersion=N