Engen Bryanston witchery

On Monday the 2nd of November I filled up my tank with petrol at an Engen service station in Bryanston Sloane Street. Later that night when i left work the car started but as soon as I pulled out it started jerking, had no power and the engine cut out. Eventually the car started and I went straight to the service station, because my thinking was they'd put in diesel instead of petrol.No one could help me and the manager wasn't there anyway. I took the vehicle in to Bryanston Sandown Motors as soon as I could get a booking. Sandown Motors came back to me a day later after stripping the car and everything to say the car was filled with contaminated fuel. I know for a fact that Engen is going to give me a runaround before they accept responsibility, that's if they do anyway.