Scared customer

I went to pour petrol of R600 and i got 3 bars on my Nissan magnite 2021 CVT plus and when I asked they said petrol has increased and I'm aware of the increase but 3 bars for R600. That pull a cashier slip for me but still 8m convinced I even went Google check the bars I should have got they are not corresponding. I asked to see a footage they said the manager wasn't in. The petrol attendants where already angry at me saying who do I think I am what will they do withy money and I don't that the petrol has went up. They were not profess at all is like they knew what they did and they wanted to scare me off.

Total moot garage in Daa****rt im so disappointed. I always go there to fill up my car but what happened today scared me.