Appalling treatment with vehicle accident claim

I lodged a vehicle accident claim on 17 Feb'16. The claim took over a week to be approved, my vehicle went missing and the assessor did not assess all damage and the panel beater took 1 and a half weeks to strip the car before the notices damage which was not assessed and additional parts were required which has caused a massive delay. Discovery refused to entertain my requests that car hire be extended. They do not return calls and are rude. One of the agents put the phone down in my ear. Discovery then forced the panel beater to return my car to me incomplete with parts outstanding. There were loose parts on the car, the bonnet was not aligned and my car had been scratched and today I realised that there is white spray paint on it. I reported it to Discovery on 16 Mar'16 and have to date had no feedback. They are not interested in dealing whit me at all. I am being treated like ******* and now sit with a car with damage which I did not cause. It is appalling!!!