Attendant fills my diesel car with Petrol

On Thursday 26 February 2015 at about 19:40, I stopped to put R350 diesel into my Ford Fiesta TDI 1.6 at the Caltex Gold CLub Terrace Service Station. I have owned my car since 01 April 2007 and have ALWAYS asked for the amount of fuel....R350 DIESEL please. I also stopped at the diesel pump in the forecourt. I paid by card and drove away. The following morning when I started my car, there was clearly something very wrong, my car was smoking and it sounded like the car was not firing properly. I left my vehicle at home and arranged for a lift to work until I could have my car towed to a Ford Dealership on Monday 02 March. I was informed late yesterday afternoon that my car had been filled with petrol, and I was presented with a bill for draining the fuel