Bad Service

Just received the ****tiest service from my car insurance company. on the 4 Aug I was contacted by the body repair shop that's fixing my vehicle to say that my car is ready for collection. When I went to pick the car up I noticed that the front end was not repaired and only the rear was. I asked what the problem was and they said that the insurance company said only the rear end must be fixed. Phoned the insurance company and asked why this was decided without letting me know even, all they could say was that there was a mix up with the paperwork that went through. I asked for the matter to be resolved the same day, after me phoning 3 times to the insurance company, they finally tell me that the 'go-ahead' was given and that the repair shop can go ahead an fix the front end. I asked if i should let repair shop know but was told that its not needed. Got a call from the repair shop today saying that they haven't gotten any feedback from my insurance and that the courtesy car needs to be back tomorrow. I phoned the insurance and they first tell me that no authorization was given but when I insisted that I was told otherwise I was told that it was given but that there was a mix up.