Problems with ATU

Hello together, I know there are already some threads with ATU and problems, but I don’t know exactly where that belongs, so I was on Wednesday at atu (date 13 o’clock), for oil change and cooling liquid exchange, well they said that takes 45 minutes, so I am 14 o’clock again and wonder first of all that the car is still in the workshop, when demand comes out that the water pump expires!!! Since I already thought only of the liquid change can that not be, right??? b then said that you should repair (260€)!!! The next day I come back there the car is not in the workshop but outside and with open hood, asked again what is going on, says the master that he only runs on 3 cylinders and that the cylinder head seal is in the ass!!! then he wanted to click on me that this costs so about 1000€ and that you are not at all responsible for it!!! Now my question what should I do, it can not be there s I put the car completely in order and with almost a completely scrapped motor now it is possible??? Does someone have a tip for me like for example: a expert or someone who just proves that the car was destroyed at ATU??? I hope you can help me