general problems of the 2012 BMW 135

Continuing coolant problems, engine shut off going down the hwy bc overheated////engine not secure-moves around literally/////camshaft timing position sensor code. On Dec 24th I purchased a 2012 BMW 135i convertible from alboet motor sports on pass rd in gulfport, ms. Before I went I specifically asked if the car had any mechanical or cosmetic damage and tasheena guidry lied and said nothing was wrong. After signing all documents she started pretending to look for the title. She promised I would get it in a week or so in the mail. The car had a ruined engine and radiator, missing front air intake ducts completely, who knows what else. They only paid 2700 bc it states stationary with mechanical damage from auction. I paid the $10,700 in cash they charged me. I'm sick to death just thinking about it. She will not repair, refund or anything like that. She finally today sent a pic of a title to the car and its got a man in mobile, al name on it. I dont think she ever even tried to get it and doubt she is now either. I have wasted more time and money on this, I feel robbed of over 10k. I have no car to start my new job the 24th. Please help me, holice biggs.

Vehicle equipped with 7 speed dct transmission. When car had almost come to a stop there was sudden burst of engine speed (to about 2500 rpm) causing car to shoot forward. Accident avoided by jamming on the brake. This then happened several more times. Dealer re-programmed ecm and problem has not gone away. Occurs intermittently. Most recent episode in my own garage where barely avoided driving into front wall when it surged. Dealer again re-set software. Clear from dealers reaction that this is not isolated incident and clear that they don't have a real solution. This is basically a variant of unintended acceleration and an accident waiting to happen.