Bad service

Yesterday I took my car in for a service as I booked the previous day on the 17th, I even mentioned that I'm going to need it by 12. To me surprise when I call them at 11:45 checking how far is the car cause I haven't receive anything from them, my car is not ready is till waiting for authorization.... That time it's 11:45. I had to go fetch my car now i must go back as if I don't have things to do with my time. I'm so disappointed at them their service is so poor.. Im so ****ed.