Incorrect payment Processing

I went to game on Saturday to make a payment for my account and they were having problems with their speed point terminal. i went to lebogang to make payment and I was paying by card and she referred me to Nomdumiso because the speed point machine was taking long to connect and when I was with Nomdumiso same thing happened and I was referred back to lebogang to make payment, she swiped my card and mistakenly she put through the wrong amount after she was told by Nomdumiso what amount she must swipe the card for .After I released that she put through R1800 instead of R1080 I made her aware and she couldn't explain why she made an error and she then called someone I believe is the store supervisor and I was told that they is nothing they can do to help me. I don't have enough money to sustain me until the next pay and I don't understand why the teller didn't focus while she was running the transaction and I regard that as a bad service .