PETROL!!!

I drove into the SASOL garage to pour some petrol. I stepped out of my car to go buy something to eat and pay for the petrol inside, when I got back I assumed the petrol was filled already so I drove off. When I got into the garage I was on 126 units and I realized on my way to work that Max( The Petrol attendant) didn't pour the Petrol. I decided to go back to tell them that the was no petrol poured , thy then said I must leave my receipt in case I want to complain later. This was bad service and didn't expect it from SASOL garage. This is unacceptable as this is poor service rendered to me. THIS IS THE EPIDIMY OF POOR SERVICE. I can say I've been ******. This is REPULSING to me.