Poor customer service

Went to the Engine garage Amanzimtoti opp Galeria mall on the 9nth of Feb 2019. I had asked the service station attendant to put a full tank unleaded petrol in my car, was even offered to have water, oil and tires pressures checked. To my amazement when I tried paying for a full tank using my eBucks card, was told they’re offline!!!!! Could not pay for petrol using my eBucks and the petrol attendant didn’t even bother to alert me of this prior to me loading a full tank in my car. Upon calling a manager, I was told they were busy in a meeting (Saturday 18:00) manager didn’t even bother to attend to my case and the attendant arrogantly resorted to saying they will pay for my full tank because he doesn’t have time to stand and argue. I ended up paying for something that was unbudgeted for because of lack of proper communication from this particular Engine garage. No signage whatsoever was indicating the garage having an issue with eBucks card.