Treating clients unfair

I am not happy with dotsure. Premiums were increased without communication. I phoned in last year December and provided the company with my new email address but use of it. I have a loyal client since 2013 from regent, then Hollard till dotsure. I have not claimed for the past years since I took the policy, I have refered 13 new clients since and all the do is increase policy premium for a car over 13years and decrease the car value. I have been calling and all I get is promises that the retention department will send communication and nothing. Today I spoke to Anthony who said the same thing. R385 to R 454 is alot compared to what I could get from outsurance, budget and first for woman. There is absolutely no care for loyal customers.