Paid for service but nothing done to my car

I'm so disappointed and hurt by the service received. I'm not sure if it's because of the car model that I have or the fact that my car had a cracked windscreen cause I don't think race had anything to do with it. I sent in my car today to the Hyundai is Springfield Park. I was number four. Everything seemed okay. I received a call at 11:39am that I can collect my car it's done and being washed. I go in at at 5pm after work to a bill of R1924 which I didn't mind as I thought I was paying for good service only to get to my car and it dirtier than I had left it. My car was never washed, I'm not even sure if anything was done. I don't trust anything on the invoice. I'm not sure if they actually did anything to me car. Please tell me why did you guys do this to my car, to me. Why? I don't understand what warrants this pathetic service I received being a cash paying customer. Then I was told to go home.