Uncivilized treatment from staff

In May I visited Checkers at The Square Ladysmith,I swiped my card for R1500+ and a transaction deducted successfully from my account and on their speedpoint it reflected decline .I had to swipe again and card declined due to insufficient funds as the payment had already been paid on the 1st transaction.The way the Till controller,Cashier and Packer handled the whole situation was so ridiculous. The Cashier advised the Controller of what happened,instead of the Controller explaining a way forward she asked for the guard to go bring back the trolley as my mom was about to walk out of the store as she wasn't aware of my card issue as she had assumed i paid at the 1st swipe or 1st transaction.They took back the trolley and the Cashier continued with other customers as if I didn't even exist. The Packer went on talking to the Controller of how my mom almost stole the groceries. I mean like really...who in their right mind goes to the store packs a trolley knowing very well they don't have funds available...stand in the long queues for no reason?I stood there for a good 15 minutes and asked what's the way foward and how to get a refund ,none of them spoke of the way forward they just continued as if I wasn't even there.Igot to work the next day and requested assistance as I work for the bank and was not prepared to go back to checkers to receive that pathetic service again.The bank returned my funds within 48hours.Please train your staff how to handle these incidents.