Atrocious service Woolworths Kollanade

I made a purchase at Woolworths, Kollonade on 26 January 2019, I used a giftvoucher as well as my quarterly rewards voucher to pay for the purchase, the cashiers however made an error and advised me that they will have to reswipe my credit card, but that I should not worry, the double payment, will be reversed into my Woolworths credit card within 24 hours, this was not done, I called the store manager, Karinda a few days later, to explain what has happened, and she said she will escalate it, it is now 8 weeks later, the money has not been reversed back into my card, and on top of that the Woolworths credit card no longer works, I have also had to pay interest on a double purchase, that was not my mistake, but that of the Woolworths cashiers, who made the mistake, numerous phone calls and nothing has happened, the service has been atrocious and noone takes accountability for what has happened, I want my money back on my card, and the card in working order