Ok, I finally had the car dropped of at Crevier BMW and they run inspection on the transmission. They literally found nothing when it comes down to fault code, which I told them may happen... Basically since it was one time thing that happened and it was not hard failure they wash their hands off, which is understandable as anyone could walk in with similar to my claim. Next time if this fault ever happens again I am recording a video of it though so they can't just get off the hook. Stupid me for not doing it back when it happened... A little remark - the car seats were dirty as hell when I picked it up and it was down to 17 mpg after 10mi they put in testing when my average prior to leaving it there was 24.5, so they have been literally reving the living sh*t out of the car...
I'm not happy...