Service Interval which led to a car not moving

<p>I took a car for 135000 service at Hatfield Audi Pretoria on the 28th July 2017. Oil change was done and service, just as I drove off the dealership the EPC & Engine lights came out and I drove slow til I reached home. I notified the technician Pieter Van Niekerk about it & he advised me to take out the battery terminal and wait for 30 minutes which I did however it didn't solve a problem. On Monday the 03rd August I took the car in for diagnosis, Pieter simply erased the lights on the car and told me the car is fine. Tuesday the same problem occured and the car started to lose power and could hardly move and I took it back. Pieter took me to the service manager, Martin, and he committed to have the car thoroughly checked. Then I received a call that they're not sure what the problem is and they suspect the plugs or injectors or SU. Since it was very late I decided to go home. My nightmare started when the car started to switch off and they said I should keep revving the car along the way. I car doesn't drive beyond 30km/h and is misfiring. How can a normal oil change result in all these troubles?? Worse Audi can't tell what the problem is or even take ownership that they messed with the car? The car was moving just fine before the service but they surely touched the wrong stuff and tempered with the car!! No one is taking ownership of this and now I'm stuck with a car which I don't know where the problem is. This is my second Audi and hopefully it will be the last if they can't fix the mess they caused. Audi Hatfield tempered with the car and now can't fix it. I regret the day I took it for service as it was not giving me problems at all... The car is out of service plan and couldn't care less. The car is now at my parking and can't drive it anywhere</p> <p> </p>