Discovery Insure.

My wife had an accident with our vehicle. Discovery insure despatched a roll back to deliver the vehicle to an assessment Centre. After four days I had to call around to trace my vehicle. Once traced, the vehicle wasn't assessed as yet. Eventually when assessed the vehicle were towed or roll backed to an accredited repairer. After almost seven weeks the car was delivered to my wife. The vehicle is repaired. Front left damages sorted out. But now the rear bumper is damaged and the front drivers door indented. Discovery insure not only book the rental vehicle incorrectly but three times we had to battle to extend the hired vehicle contract. My vehicle had a front smash damage but returned in a worse state. What am I to do about this. This whole cenario between Discovery insure and the reputable repairer was and is still a nightmare. Can someone please assist me.