Contaminated Diesel

I've been using this garage since it started up some 20 years ago (Caltex) until recently when it became Astron Energy. They sold me contaminated diesel which caused my vehicle to lose power and come to a halt. I had the diesel checked by the Agent Jaguar Land Rover and by a reputable fuel Testing laboratory who also confirmed the contamination. Astron advised that they check their diesel and it was not contaminated! But no proof has been presented at all and is all hearsay. This has been going on since the 13th June! Created damage between R 92,000 (Agent) and R32,000 having the fuel tank, fuel lines flushed, new fuel filter and diesel fuel injectors "cleaned" or new injectors replaced. Disgrace the way they have handled this claim!