poor service

On de 3dr of March 2015 asked de petrol attendance to in diesel in my car by he put his in petrol. They then tried to drain it off which some was left in the tank, filled up the car then I drove off. Packed the car 3days later when I wanted to drive the car didn't want to start. Called the garage management, who brought their so called mechanic who checked it only to find that the fuel was contaminated. Tored the car to Bethal where then removed the injectors, which were sent to bosh in Middleburg. Quotation of R10500 was emailing to then. Now they say it is not their responsibility to fix my car