Theft of money

I was at the Sasol Petrol Station in Heuweloord Centurion this morning at 6:30am. I requested for petrol to be filled in my vehicle. While the attendant was filling the petrol, I went into the shop to buy a coke. Returned to my car, handed him the money, sat in my car for a few minutes but never got my receipt. So I left. About 3 km away, I checked the range of KM on my car and it was the same as before I got to the garage. Went back to the garage. They gave me a receipt that was printed, however the time on the receipt is after I left the garage. Their camera footage shows the guy standing at my car, but they are unable to prove petrol was filled. Several people have complained about this garage and this very type of thing. I do not believe a well established name like Sasol would rob a client who fills on a regular basis. I have started a campaign against this garage. Social media as well as family and friends. I request anybody reading this to stay away from this garage as well.