The service that my car was turned in for was neve...

The service that my car was turned in for was never performed. I had to bring the car in a couple of times after leaving the center as things were left incomplete. It was still not done after returning. There are no checks and balances in place. Even after reporting to the service engineer, I was informed that the service manager would be contacting me to address this immediately. Its been more than a week and no one has gotten back. I have been a BMW loyal customer for more than a decade but now I am ready to call it quits and take my business elsewhere.