No acceleration and warning lights after collecting car from the dealership

<p>I booked our car in for a service at Mercedes-Benz Bryanston to change the air con filter and adjust the headlights. </p> <p>After collecting the car, driving for about 3km, I turned on the air con only to be greeted by ALL the warning lights in the speedometer cluster. At the same time I also lost ALL acceleration and just made it to stop off the main (Grosvenor) road. After several attempts I managed to start the car and drove for about 200m before the ignition cut and losing acceleration again. I barely made it into Bryan Park shopping centre where I was pushed into a parking. </p> <p>This is my first and last time I will buy a Mercedes-Benz </p>