Bad Service

Towards the end of May I took my car for 195000km service in a very good drivable condition, when my wife picked it up after the service it was cutting when you move from gear 1 to 2. I took it back and they told me I need to change the fuel pump. I did that in July and I paid heavily for it. When I picked up now it has a iddling problem. I again took the car back to McCarthy Audi Church Street, I was informed I need to change the iddling valve and a belt. I did that two days later the iddling problem was still there. I took it back to Audi on friday the 11 of September 2015. I was called later by Church Street Audi, saying that my car is perfect condition. I didnt drive it over the weekend. My wife used it to Middleburg on Monday for the week of the 14th od September 2015. On Thursday Morning, my wife calls me tha the car is loosing power, whilst on the phone, it has now started smoking within two minutes the car was on fire. As of now that car has burned. I went back to Audi and ask them of their opinion, no one could say anything. Who is the technician who was working on my car? When I took it back and told them the car has a problem they told me I should just drive the car.