Headlight issue that was worked on by Mercedes

I've been very happy with Mercedes family so far for years until I had an issue recently with my headlight. In May 2022 my left headlight started to malfunction, intermittently switching off and on while driving. This was during the rainy period in Jhb. I reported this with Mercedes in Sandton, Rivonia where I usually service and it was booked for assessment. In the afternoon when I went to fetch my vehicle, Mark from service department gave me a report that they stripped the bumper and removed the headlight then opened it up and cleaned some water residue from the control unit of the light. The light worked fine after that until early this month of July when the issue came back.

It was booked again in July, only this time I was told I had to buy a new headlight as the workshop is suspecting the vehicle had been in an accident. This disturbed me because nothing on the body of the vehicle suggests that, the workshop only relies on a small glue-like mark that they showed me at the back of the headlight and a small mark which shows that the light had been fiddled with before. This of course, I explained to them, was caused by the previous handling by them that was done in May and that as far as I know the vehicle has never been in an accident. Otherwise they could have picked up this accident issue back in May if it existed and not on the second time when I bring the vehicle after they fiddled with it .I have also reported the incident with Mercedes South Africa and to this day, for about 4 weeks, I have been driving without a left light which means I cannot indicate nor see properly at night, and this translate to possible traffic tickets which I will send for their account. The vehicle is still under motor plan, but this is what I must endure on a daily basis !