Shell Lyndhurst

I am writing a complain regarding the shell garage in Lyndhurst Johannesburg I put a diesel on Wednesday 5/3/25 then my car didn't start so they have called someone to come drain the diesel out only to find the the diesel was mixed with water. Then the management never came to engage me they let the petrol attendant to attend to the matter.so today Friday 7/3/25 while driving the diesel is coming out I called the garage again they let the petrol attendant talked to me there is a smoke on my car. I am thinking of opening a case with the Saps