Shocking mistreatment & damage to my car!

Shocking mistreatment of my car! Absolute reckless and carelessness when cleaning my car (car was still dirty with streaks all over it!). My car smells like someone smoked in it and there was ash on my steering wheel! I DON'T SMOKE! They were so careless that they jammed my USB cable in the seat damaging it , it was clearly done with force! I'm concerned that the major service performed on my 4 series was now done correctly and professionally?! I go out of my way to look after my car only for the employees at BMW the Glen to disregard my car and treat it as they deem fit, WITH UTTER DISREGARD! If you value your vehicle at all, DO NOT SEND IT FOR A SERVICE HERE!!!!