I made an appointment online for service on my 201...

I made an appointment online for service on my 2010 Chevy Camaro. I had email confirmation of the appointment. When I arrived they had nothing at all stating that I had an appointment. I took the day off from work to get the service. I forwarded the email to the guy I was dealing with. He was acting like I was a liar. I needed tires and they told me they did not have tires for my car, even though the website let me pick out my exact tire and schedule the appointment. Do not go here for service. These people don't have a clue what is going on with their own system. I went down the street to the Chevy dealership and they took care of me perfectly, even without an appointment.