Price shock at 20000 he inspection

Hello people. We had our gas bomber now for the first ( 20000) inspection at the Autohaus Most in Mainz. When we got the bill, I was shocked. Inspection 250 Euro annual climate inspection 45 Euro gas system inspection 250 Euro then still paid the fairy tale tax and a total of 600 Euro. I almost fall off the faith. In addition not washed, not sucked out!!! And now also the valves !!!!!!. Service 6 ———————– Mercedes and BMW work better there, have b a BMW in Mainz mechanic learned. Get the money back in so when you have bought a reimport?. Does someone have a maintenance plan and comparison costs for the gases? Greetings, now from Bingen hi73mi