Went to BMW for a issue with my Wifes car tht kept...

Went to BMW for a issue with my Wifes car tht kept shutting off when the wheather was warm. They charges for a diagnostic, which I questioned from the get go on the results. 1600.00 later they said the car was fixed, broke down and had to be towed after less than 12KM drive. Further diagnostic, they recommeded one thig or another, I had to basically research and come up with the diagnostic. They have now replaced the part I wanted, and seems to be running, however now they said something else is wrong and this problem was not there when I took the car in. This time I got dinged 1500.00...so here it is, perhaps they require more training or attitude adjustment. Not sure, but Im now turned off with BMW and there Dealers.

I am now shopping for a replacement but won't go to BMW eventhough my wife likes them. Maybe try Mercedes this time around.