Service excellence thrown out of the window

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On the 28th September 2021 around 18H30 I went to buy electricity there was a line but I didn't mind on my arrival to the till the lady that was working (They call her sis'Nomvula ) didn't want to sell electricity to me because I have written the meter no on a piece of paper. I tried explaining to the lady working at the till that I usually buy electricity in their petrol station or I buy on the bank app which is where I accurately wrote it down but I currently do not have money on my bank account and the slips have faded but I was met with arrogance and attitude the lady said I should go back home to fetch the slip and she started knocking at the window and made noise. I went back home fetched all the slips and when I came back the lady was already knocking off and there were new cashiers both male and female starting off their shift when I tried buying from them they ignored me and literally called customers to serve them whilst I was on the till until the owner of the garage appeared and when I also tried talking to him he was more arrogant than anyone because he wasn't solving the problem at hand because he said "I should buy at the bank that I usually buy at and not bother them in their shop. I'm only asking for your intervention because the Sasol in Braamfischerville was meant to provide us with services as it's customers not to make us feel like we are nobody's.