Engen Springlake Durban - Didn’t want to give me back my bank card.

I was at your service stations in next to Peter Road in the Springfield area Durban. I asked the petrol attendant to fill R300 worth of petrol to my car. And he filled as instructed, when it was time to pay I produced my card to make a card payment. As he was processing my payment he discovered that the machine couldn’t process cos it was off line. I then proceeded to the cashiers inside to process my payment. The cashiers tried again to process my payment, still the system was off line and we tried more than 5 times no luck. The garage manager came through to assist, he too had a problem. They asked that I withdraw cash to make the payment, which I refused as I was going to incur bank charges which I was not willing to accept. Asked the Store manager for his number so atleast I can ewallet him the amount due, but he said that it was not company protocol. Asked for a bank account that I could deposit to, still he suggested that that was not accepted as protocol. He then asked another gentleman whom I assume was the owner of the garage to make available another machine so they can process my payment...still the payment would not go through. What upset me with the whole experience is that I had been waiting in the garage for almost an hour and when I was starting to show my frustration, the man whom I assumed was the owner told me to relax in the most condescending tone. I then had a verbal exchange with him and the store manager as to how he can ask me to relax when I’ve been waiting in limbo for almost an hour. He then asked for my bank card to process my payment, he then suggested that the problem is with my bank account. That upset me a lot. When I asked for my card back he said he’s not going to give me my card bank...and it was ay that point that I told him to keep it since he didn’t want to give it back and they didn’t want to take the other options I put on the table for them to receive their money. I am highly upset on the treatment of this individual and for the inconvenience that it caused and is going to cause me by cancelling my bank card and subsequently I have to order another one from my bank and that’s additional charges that I would have never incurred if these individuals opened their minds since convention wasn’t an option.