Bad customer care at KFC. I want to be refunded my money that's due to me

On the 20th of April 2018 at 16:14pm I went to purchase 2 streetwise meals and KFC at Port Elizabeth at Cape Road. I used my cheque card to pay and it declined and I had to use other methods to pay. The following day when I checked my bank statement, the transaction went through even though on the speed point it declined. So this means I was double charged for my meals. Since I have reported this to KFC management at Cape Road I haven't had any response. I have proof on my bank statement and the declined slip