Complaint about a *****y experience.

At the end of October 2017 I took my car to Audi Centre in Port Elizabeth for service as usual and I received it in the late afternoon. Upon picking it up I noticed that it was not performing as normal, but I thought maybe it was a mistake, it could bad fuel and what not. On the following weekend I decided to take it for a long distance drive and I drove to Plettenberg Bay traveling with my friend. I put in Shell V-power as recommended by the experts on these cars just to make sure I had the correct fuel in. On the way I noticed that on full throttle it was jerking, which I found very funny as I know my car and how quick it picks up. I then suspected something had happened during service but I did not want to quickly come to conclusions. I thereafter also noticed that it was consuming oil, I'd be buying a pint every week, which was very percu****, though it's normal on these cars to add a pint atleast once a month. I there after recieved a call from Audi SA survey centre asking if I was satisfied with the service that was done on my car and I told them I was not, my car was not fine after the service while it was a beast before, with not a single problem, they then advised me to call the dealer and complain, which found irritating. I could not understand why was I supposed to be the one calling after informing them I was not satisfied, I couldn't understand what was the aim of the call in the first place. OK, then I took another trip to Grahamstown and I drove faster so I could see what the problem was. The jerking got worse, I suspected air pressure, it could be the only reason according to my experience. I then started to notice that if I stand over night the car left an oil spot on the ground, and this according to my experience, connecting it with the jerking, it could only be a faulty EGR valve. I took the car for a checkup on a different dealer, since I wasn't going to take it to the people who made it faulty and when I got there I saw the worst. The pipe from the air intake manifold to the EGR valve was broken and clearly by force, and it was reattached by means of two cable ties which were looking new. The pipe itself was looking older than the EGR valve and as a matter of evidence there was oil deposit all around the valve. Mind you I had a new EGR valve fitted last year by a different dealer and I personally inspected the car afterwards and there was nothing like that, I have people from that dealer as my witnesses. So I was devastated. I couldn't understand why a well known dealer that charges R3800 for an oil service do this to my car. I then call Audi Center and was transferred to the woman who was responsible for my service by the name Gcobisa who when I told her about the matter denied that they even touched the engine, and I asked her how then did you perform oil service without touching the engine. Funny isn't it? She then told me she would get a workshop manager to talk to me. The guy then contacted me telling me he would watch footages and see if this was true while I wait further with a problematic car. I am still waiting on them and I am preparing to engage lawyers in the matter should they not cooperate. These dealers can be *****y and I want the consumers to be aware of their ways and unfortunately my mother raised no fool. Thank you...