Petrol Attendants charge you but don't fill up your tank

Engen White City Jabavu's petrol attendants are ******. My fiance and I had a very bad experience today at Engen today. We pulled up at the filling station to fill up. When the attendant was done "filling up", we drove off. Only to realize that the petrol gauge was still where it was when we got to the garage. We drove a few miles thinking that maybe it'll go up but instead it was emptier than ever. Then it dawned on us that the car was actually not filled. We drove back to to Engen to go lodge a complaint with the manager but we got insulted instead. The receipt we received did not match the time we were there and the amount. He were given the wrong receipt. I'm really horrified by the pathetic service given by Engen and wouldn't recommend it to anyone. In fact I'd advise that people stay away from that filling station.