Poor service received,I'm very disappointed and angry

I had an accident in May on a Sunday and I called the insurance and the car was towed.The car spent the whole week at the guys that towed it before it was taken to Pro beat panel beaters to be fixed.I had to make calls to enquire before the car was taken.The car took too long to get fixed.When I enquired with the panel beaters I was informed that standard bank was taking too long to give authorisation for the car to be fixed.After numerous calls to the call center,the authorisation was finally received. The car took +- 8 weeks to be fixed by the panel beaters.I am the one who had to keep calling them to enquire on the progress.I finally received my car on Thursday 26 July and when I had to sign the paper work I was informed that 4 parts,which includes the bonnet and fender are not original Audi parts.They told me that is what insurance authorized/covered.I called the insurance department on the 1st of August to lodge a complaint and after being sent from pillar to post I was put through to Refilwe who put the phone down on my ear when I tried to explain my complaint.I called again on the 03rd of August,i was put through to someone but I only got a voicemail.I then tried to call again today,06 August and I could not get any help.My car bonnet doesn't close properly.The repairs done are not upto standard.I just need standard bank to sent out an assessor to see the work that their panel beater did on my car.