pathetic service

I was paying a credit card bill and swiped with an awards card.i instructed the cashier to swipe 7970 but after realising that my limit is 7500 i instructed him to cancel and make it 7500 instead. He arrogantly told me that i didn't tell him and when he asked for assistance he told Ayanda that i didn't say anything and i told him again, that i did.this two just told me with a bad attitude that they can't reverse the transaction because it's a gift card.now shouldn't they have cancelled and give me back my money since obviously they were going to be over on their banking? I had to end up using my bank card to pay the outstanding balance, this has highly inconvenienced me.