Car for repair once and never again!

Car for repair once and never again!

My 2016 BMW 3 series had to be towed and I opted for Hermann Rhein because I thought that everything would be done well there. Because it is a very large BMW dealer.
When my car arrived it was said that it was probably just a little damaged (software). I also told him that the service was overdrawn 5,000km, and he told me that it wouldn't work and none of it would break. After a few days, I got a call that the car was completely broken. It said the diesel pressure sensor was broken and the entire electronics + control unit was defective.
Damage about 10 thousand euros I should pay 2 and BMW will take over 8.
I said I didn't agree and a month later Mr. Schmid called me and told me that more is broken and that BMW will take care of everything except for 400 troubleshooting. I said ok then let's do it. 1 week later I was able to pick up the car and then Mr. Schmid told me that the turbo was also defective, but he also exchanged it. I never got this information before and was never asked for permission to repair the turbo. When I had my car I drove 20km and the car had something again.
Now the air flow meter was defective so back in the workshop.
There Mr. Schmid told me I can drive it until part is there. I wanted a written confirmation that I could drive it if something broke, but I was just yelled at. And pissed off unfriendly that if he says it works then it works.
So I didn't drive it from Friday to Monday and bring it straight to the workshop on Monday. Car was repaired in 2 hours and I was finally happy.
1 week later I got the call that I still have to pay 900 for the turbo although it was said that it was repaired free of charge.
I said I can't pay it at the moment and it doesn't matter when I pay it. And today comes the payment reminder ...

Hermann Rhein repairs things without letting them know, without asking if I want it and I agree to it, although they have to.

Very bad service, the car was damaged for 18 thousand euros and then you get fooled. And exploited.
You're being fooled