The service department is the worst I've ever been...

The service department is the worst I've ever been to. They tried to double charge me on labor for an oil change. They wrote my mileage down incorrectly, which put me over my extended warranty mileage. I figured this out after I paid full price for the repair. When I came back to point this out, they said they would fix it and I would get a check from the warranty company. It never happened. I called and emailed about this, but they never answered the phone or returned messages or email. Now they tried to tell me I needed by brakes flushed when they had just done that a few months back. I have to call multiple times before any picks up the phone. I usually just show up at the shop to ask if the car is done because I can never get in touch with anyone. I will never, ever go back there. If I could give them negative stars, I would.