Bad service

I waited for 5 minutes if not more at Shell park service station Alberton to get service, as I opened the car door to ask how long do I have to wait to get help the attendant came running, I then asked him to pour R300 petrol and when he came with the speed point it was R301.10, I then told him that I asked for R300 not R301.10 he then said he will pay my R1 and I told him I want it, he went to other attendees to ask for the R1 and they didn't have and he went to go ask for it in the shop and came back and gave it to me.

I'm really not happy with the service I got.