Tail Light Switch problems of the 2010 BMW 528

I took my vehicle to BMW irvine in California for a recall on my tail lights, they stop working, the recall was to replace both sides and they only did one. The side that burn out but they left the same connector which was burnt and with the wires loose and I wasnt even notify when I pick the vehicle until when I start driving the light stopworking again. They answer is not t heir fault dont care. Now my vehicle doesn't run and I got all kinds of wired messages on my idrive. Half way done recalls??? bad customer service.

I received a displayed message there was a malfunction with the rear lamp. When checking the tail light assembly and wiring, I noticed the connector on the tail lamp assembly was melted (plastic) where the brown ground wire connected. The male/female connector parts got so hot that the plastic connector was melted where the ground wire connects. This was on the drivers side, but it is likely the passenger side would have the same problem. The heat generated to melt the plastic connector could cause the ground wire to burn and the brake/rear lights to fail. With a failure of the rear lights, an accident could happen.