Depressing service

Worst experience I ever received, I get depressed just to think about what I am currently going through with these people. My car has been with them since Easters. They don't have any curticy. If I told call will never know what is happening to my car. I communicated with the supervisor it's worse. Went to do a follow up today. The supervisor promised to call me back today with response. The only response a sms telling me they still waiting for my ordered part. What an experience I am going through with these people it is depressing.