Car Service

I have always taken my car to Audi the glen for service since I bought brand new. However since my warranty depleted as usual I have to pay from my pocket which is fine. But in my last three service evaluations, I monitored a trend every time I take my car for service and pay for that service 2 weeks or three weeks after that my car breaks down. I took my car to an independent technician, who did an inspection and discovered that, the reason my car had destroyed two fuel tanks and a module was as a result of broken pipes that leads to the fuel tank. Upon further inspection we discovered that those pipes had been tempered with (broken). The cover underneath the car that is meant to protect the covers was not damaged which was strange considering how those pipes where damaged. I have never taken my car anywhere else for service except Audi the Glen but after those incidents I will never take my car for service there ever again.