Manager at Danmar rude and arrogant refuse responsibility for damages they caused

My car was taken in for repairs. It took more than 12 days for repair to be completed. When I collected my car various parts on the car was not working - hooter, indicator, from left light. The worse was that the car was given to me with additional dents and being a white car had black paint marks on it. I complained about the Dent and other. The service personnel involved the manager who tried to ignore the real issue at hand which was where did the dents come from. She proceeded to tell me my Fender which they had dented was plastic, when I asked if the mag was part of the quote she proceeded to say it was a plastic car with wheelcaps and that I drive through tar therefore the black paint marks . On both these she was corrected by the Autobody manager. We also looked at pictures the boot was clean when it arrives. There was also no dents on the right hand Fender. She continued to try to intimidate me with a whole lot of silly reasons on why the dents and other was there. The right thing would have been to check their internal cameras first and her facts first. I now have additional damage which they refuse to investigate. This would should not deal with customers.