Very Angry

This morning I filled up at BP The Cradle. Requested R1000 ULP 93 which was put into my car. When came to payment Petrol attendent charged me for ULP 95 even though received ULP 93. When confronting attentent sayin over charged me kept say didn't You want R1000 that what we gave you. Not understanding ULP 93 cost R23. 95 liter and ULP95 is R24. 17 per liter. I Know it's not much but still it works out to about 500ml of petrol less and About R10 difference. But the matter is no one wanted to take responsibility or unstand what I was trying to get across to them, even the supervisor on duty came across but all was not helpful at all, eventually I had enough and drove off very angry. Petrol is expensive as is right now then you still get cheated out of petrol. I have been supporting this garage since it opened as easy to pull in on way to work and fill up. As of today will not be doing so anymore. If they did that to me, how many other have they done that to.