New vehicle was purchased from Heermann include re...

New vehicle was purchased from Heermann include retrofitting a trailer hitch. The hole for the wiring harness was milled too large, the built-in rubber plug contracts over time and does not seal the too large hole. This has ultimately led to the battery in the trunk under water and on the highway, the entire on-board electronics has failed (including power steering and brake booster). Clear evidence by BMW workshop that the installation was faulty, no interest in correcting the error or to participate in the costs. Simple reference to the expiry of the warranty although the defect with life-threatening consequences at installation was approved accepted. Behavior and quality for a BMW dealership more than questionable, so I strongly advise against a purchase and would buy directly from BMW