Don't care about customer complaints

I am insured by FNB but it is underwritten by Santam. I filed a claim and the work was done by Renew-It Rivonia. Leading up to getting the work done i will admit it was a fairly smooth experience and i appreciated it, but once the work was done that's when it all fell apart. Renew-It Rivonia has appalling service! Items were ****** from my car, petrol went missing and no one can tell me why, there was a clicking sound coming from my car and my wheel alignment was not done post repair to tyre. I informed Renew - It and they kept ignoring my complains (so much for the guarantee on their work - its been almost 3 weeks and no contact back as to what they will do about it) anyway i informed my insurer about this and they said they would take care of this and a representative would contact me, 2 weeks later and after numerous emails asking for updates even my insurer hasn't bothered to come back to me...Should anything happen to me or my vehicle they will have to pay more to repair it so why aren't they efficient enough to fix or even care about the problem before it gets worse??