I have an appointment for an oil change originally...

I have an appointment for an oil change originally for October 19 but I'm not available on that day so, I called the Service Department to reschedule. The guy who answered the phone said that I'm all set for October 23, 2015 at 10:00 a.m. but when I went there, Chris simply told me that there's no appointment under my name and if I want, I can wait till they're done with the other customers. I even took an off just to be there for the oil change prior to my doctor's appointment at 12 noon. Worst is, I e-mailed the Manager but he ignores my e-mail...no reply even after 3 days already. I will NEVER recommend them to my family and friends.