The worst customer service EVER. We have been cust...

The worst customer service EVER. We have been customers of the Aurora dealership for nearly 20 years. I was give an appointment for oil change on Thursday. Arrive at my appointment time and was told I could not get service and shoud not have been given a 4:30 pm appointment as the technicians were soon leaving. I was then given an appointment for Saturday morning at 8am. Was told I wound be in and out (as I had an appointment). Arrived Saturday morning promptly at 8am .Upon arrival there were already approx. 12 cars in line. Alan (very new & young) told me I wasn't there at 8 when I asked what's going on. I told him I was absolutely there at 8am as instructed by him, he then said "you were not here at 8, how come you're at the back of the line then?" INFURIATING and INSULTING!!! So now I'm called a liar by your employee! Are you kidding me?! Later I was made aware that customers had been lining up since 6:45am. NICE!!! The WORST experience E V E R!!!!!!!! The appointment system is deplorable and completely ineffective!
VERY angry, disgruntled, devalued customer (who has purchased THREE vehicles from this dealership). WOW!!!!