No Customer Service after You've Bought a Car

We purchased our first BMW from Momentum. After 5 hours at the dealership, we were elated to drive home in our certified pre-owned car. Unfortunately, on the way home we noticed that the inside of the car was very dirty (the cupholders had not been cleaned, the back seats were dirty, there were smudges all over the steering wheel and ceiling). We called our salesperson, and he said "bring it back anytime and we'll take care of it." Trusting that that was the case, we went home because it was late. The next week I drove an hour out of my way to bring the car in, and I was told there was no one available to wipe down the inside of the car. So I made an appointment for a Monday morning (which I would have done in the first place if I'd been asked to do so). I arrived at the Monday morning appointment and was told that it would take 1 1/2 hours to clean the car. Since I figured they would do a great job, I agreed to wait. After an hour and 20 minutes, the car was ready. When I got in the car, I could not tell that they'd done anything--all the mess was still there, except what I had cleaned up myself. I pointed this out the salesperson (Mazhar), and he told me to take the car over to the service dept. myself. I had to go to work and was unable to do so at the time. Next, our temporary plates were about to expire, so I called the dealership. I was told that my salesperson would call me back. The next day he called me back and asked what the front desk had told me. I told him that they had told me nothing. He then called me back to say that my plates were in--but no one had called to tell me that. When I went to get my plates I saw in the log that they had been there for days with no call to us. The final insults to injury were weak excuses from all levels of management at Momentum and then a final, follow-up email from our salesperson (obviously automated) asking us to refer business to him so that he can "treat them the same way he treated us."
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