One problem after another

I had an accident in February 2015. Took my car to dbn central panel beaters for repairs through my insurance company. I've had the worst experience with Mervyn as he was managing my repairs and did a terrible job. He is aware of a noise in my car that started after my car was released from dcp. This noise was not evident after the accident. Mervyn is aware of that. He says he sent my car to Kia for the engine to be checked and the tests came back clear. I'm still waiting for proof of that feedback.. My rim was damaged on their premises but eventually fixed because I wouldn't keep quiet. My windscreen wipers were wiping off my windscreen as they weren't fitted properly. He sorted that out but now I've noticed that the wipers are shifting AGAIN. The Kia sign on my spare wheel rim has disappeared. The rubber on my passenger door has disappeared. All this has happened since I took my car to dcp. Worst experience ever! I need my car sorted and not by Mervyn.