You bought a five year old vehicle that was advertised online, as is, without test driving it, and sight unseen, from a place you had never dealt with before? Did you check out the dealership references, or just put your faith in their BMW sign?

Sounds like they didn't treat you very well, but I am sorry to say, you appear to have painted a target on your back.

__________________
2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue