Petrol not poured

I went to Sasol garage in Bedfordview the one by the n3 off ramp on the 28th December at 22:27 that's the time on the invoice I was only buying R100 petrol and the attendant did not put petrol because my tank was at 31 and when she gave the invoice I left the next morning went to engen garage and I put petrol of R200 and my tank was at 300 please there is some kind of ***** being done by your attendant and I will never use that service station again