Faults after car was fixed

I was involved in an accident on 15 February 2017. My insurance ( Alexander Forbes) advised that it get towed to the nearest service provider appointed by them, which was Renew-It Edenvale. My car took more than two months to fix and I was advised that I have a life time warranty on repairs and that they remain at my service long after the repair has been completed.

Two months after my car was fixed, I started having problems with the right light (accident side) and the towing flap fell. I phoned Renew It in and spoke to Sharon, I advised Sharon about the towing flap because at the time I thought the lights need to be replaced by Mercedes Benz. Sharon advised me to bring the car in.

I took my car to Mercedes Benz Bedfordview, when my car was due for a service and asked them to also replace the light. Mercedes Benz advised me that the light is fine but the wiring is faulty. They asked me if my car was involved in an accident because the wiring was not done properly when the car was repaired and therefore, they suggested that I take the car back to Renew It. Mercedes Benz also indicated that if the towing flap was replaced properly during the repairs, it should not fall by itself because when you open the flap, it must just hag out.

I took my car to Renew It and I spoke to Brogil ( not sure about the name but something like that). She told me that there is nothing they can do because they do not handle the electrical issues but only fix the body, maybe the writing was damaged by something, which has nothing to do with the accident and she said maybe someone opened the flap intentionally and stole it. She said I must bring the car back the following week, they will just access it but do not promise that they can fix it since it is over 130 days since the car was repaired. I am surprised that now she says 130 days is a long time but their repair certificate says I have a lifetime warranty and Mercedes Benz has also stated that the wiring issue in the lights is due the repairs done due to the accident.

The car is three years old and never had a problem with the towing flap or the light until I was involved in an accident.

I need this issue to be escalated and dealt with ASAP because I get stopped all the time by the traffic cops due to the light that is not working.