WHAT HAPPENED TO TREATING CUSTOMERS FAIRLY

I'm beyond words, took my car in for service with no problems. I get a call and get told that my battery is faulty. I had never experienced problems with this battery. I collected the car on the 9 and went straight home. parked the car overnight and when I start it the following morning, the car wont start. I suspect that my battery was swapped with a faulty battery. I phoned the dealership in the morning complaining about this, they promised that a manager will call me. till now that has still not happened.