Discovery mess

I lodged a claim for my car because something on the highway struck my car, cracking the windscreen and damaging the frame. The claim was authorised, obviously assessor took photos. Discovery, not knowing cars and not listening, authorised a seal and a door beading. When I went to the panelshop yesterday, I find my driver's door completely stripped and the right front fender removed, also the removable roof panels (Jeep Wrangler). None of this has anything to do with the claimed for damage. When I spoke to Discovery they said that the shop "misread" the jobcard, which is untrue because Discovery gave them the incorrect instructions. This level of incompetence is shocking, and I will be looking for a different insurer.