horrible service - incomplete car

on 10-07-2025 I went to this BWM workshop to collect my car, only to find out that the car is not 100% repaired but I guess nobody cares. after sending them whatsapp texts since monday 07-07-2025 asking them what time should I come pick up the car nobody answer all week, only to get whatsapp texts when they see me at their door step. yes that's how rude they were even when I personally at their reception they decided I am not worth their face to face time. I was being texted whilst at the workshop. then on friday 11-07-2025 I have to return the car as the engine light was not going off and a guy called Donaven came with a diagnosis machine which showed the red line that there was a problem of which I have a picture of and Donavan only shutdown the red light just so I can get off his back, I asked him that I see you have switched off the light on the diagnosis machine but there's still showing a redline on your machine that something is wrong and he lightly just said to me don't worry about it. Donaven gave me a faulty car highly aware of the fault. when my car got into the accident it was on full tank petrol only to find it empty to the last bar on pick I asked them to send me a picture of my petrol reader showing that it was full (I asked them on the 11-Jul and today it's 15-Jul) still no picture and no comms at all from the workshop.