Motor accident group

I took my vehicle the MAG (Selby) to have my bumper and left back door replaced/fixed, they promised to have the vehicle fixed on the 20/09/24 two weeks after I booked it in (I had no issue with the timeline) however I never got my back on the mentioned date, today 23/09 they called me to say the airbag light went on (question, what does the airbag light have to do with the bumper and the door?) I asked to speak to a manager, I am still waiting, they promised to call me back in an hour (I waited for almost 4hours, only to tell me they still have to do quality controll...this is the worst service I ever received..shame on you MAG !!!😡😡😡