Petrol pump

This evening after 21:00pm, my hubby and I went to Engen Northway Mall in Pietermaritzburg to fill up R200 unleaded. When we arrived there the range was 240 km (half tank). The attendant by the surname Dlamini came to assist, however, when I started the engine after paying, the petrol gauge didn’t move and the range didn’t increase, it was still 240km. I then told the attendant about this, and asked him if he did put petrol, and he said he did, he told me to drive around maybe the gauge will go up and it didn’t. We asked him to put another R50, and it didn’t go up even with an inch. We asked for a manager or a supervisor, he told us that we can come back in the morning because none of the 2 is available. I’m so angry because they are treating us as ******** fools.