Part of claim not authorised for no reason

My car had an accident and was duly assessed. It was under repairs for almost a month. When it was done, I discovered part of the damage had not been repaired. Despite numerous follow up, nothing has been done. I have simply been ignored, treated like a nuisance. The worst client service experience ever. The attitude just screams \please find another service provider\". I get the message. I will look elsewhere."