Obligation to prework with high pressure cleaner? Car was not clean after gantry cleaning

Hello dear fellow forists, I just got very angry at my gas station: I took the most expensive car wash extra, because a high-pressure pre-wash is integrated. After the laundry the car was not clean and also the cloth for the wax removal from the disk had been forgotten. So in the store and noted that the car unfortunately did not get properly clean, despite the most expensive laundry. ANSWER: After they have worked the with the high-pressure cleaner before? I: No I had no suitable small change. ANSWER: Then I can do nothing for them. I: I did not know that I was obliged to pre-work. ANSWOR: They are also not. But if they don’t do it, I can do nothing for them. I am then out without greetings with the wax removal cloth. At the last time a “after-wash” with the simplest program was possible without any problems. What do you think, how should I react? Is there the pleth to pre-work?