Transmission Gear Indicator Problems of BMW 545

I own a 2005 545i . I was pulling into the gas station to refuel. I began to hit the brake the car started to jerk back and forth and then it accelerated on its own. I began to pump the brake and the car stop short of the Mini mart thank god! afterwards a gear indicator appeared and the car went into safe mode and shut off. I couldn’t start the car and I tried for thirty minutes and only the gear indicator would come on. I then called a tow truck company after thirty minutes, right before the tow truck arrived the car started. I took the car to BMW of roxbury and I was told that since my dsc light was on that needed to be repair to alleviate the problem. After challenging them, how can a add on feature (to increase stabilization and traction) that I never used when it was working cause the car to drive by itself. They dropped the issues called me back after a hour and said they drove the car around for 25 min and nothing is wrong. Also there was no record of the gear indicator coming on even though it came on twenty or so times when I was trying to start the car. So I guess I will get my car back and pay them a few hundred dollars for nothing. Is fine and there is no record the gear light ever came on. So.

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