Reported problem not getting resolved

My car got damaged in Dec '14. It was taken for an evaluation @ the authorised partner. The panelbeater appointed could only take my car @ 27 Feb. Despite having a loan car from OT, I could only get it for 1 month (while my car is repaired) and was told I could drive my car with the damage so long. Since my car is in at Wonderboom panelbeaters I made several calls to them following up, each time telling me my car is in for a spray job. Eventually (after 2 weeks) I got a call from the panelbeaters telling me that that there is additional damage and my exhaust also needs replacement for which they need further approval from OT. This despite the exhaust being on approved evaluation? When I complained and phoned again, I was told that they are waiting for spares from Huyndai. No one knows when the actual spares were ordered and who is really to blame, and in the meantime, I still do not have my car, people is talking over each other, and I need to take the loan car back with no 1 willing to give me another car. Now Outsurance and the panelbeater is blaming Huyndai? In my opinion, I pay OT for my insurance, they are responsible of sorting it out. Why must I complaint to Hyundai?