CAR NOT FULLY REPAIRED

My car was booked in for repairs 19/10/2017 Released on 21/11/2017 exceeded time frame , my car was bumped and i have reported and was advised to take to the repairer which didnt complete the job and when i asked them i was told my insurance didnt authorise to align the rear lights with the car and the reason i was given at first was that they didnt attach pictures for that , after few days now the assesor is saying its not related to the incident and i asked him how on earth to you take out the lights if he is saying its not related to the accident he fails to give me reasons hence the car was given back to me and his company was fully paid . It does not make sense to me how its not related to the incident when my car was ok prior to that incident aand the assesor said it wouould have made sense if only the one side was affected .