Terrible terrible service from Audi Sunninghill. My car is now releasing smoke

Audi sunninghill service not done properly. Vehicle now releasing smoke Took my Audi A4 in for service on Wednesday. Thursday when I drove it it light the engine icon and it was rerving when I drive. I called Ruben who was the technician and he told me to book in the car again. He didn't seem to acknowledge that the mistake was done when servicing the car. Today is Saturday I went hiking in pretoria and the car is now releasing smoke.. Too many icons on shown including oil. What was done to my vehicle. I'm re annoyed right now!!!!