TFG refund

I purchased a pair of shoes online on the 12/07/19 only for my order to to cancelled on the 14/07/19 due to “ insufficient stock” or “damaged goods” yet they were able to process the transaction without hesitation! I called a week later to follow up on my refund which I was told would take 10 days, which did not happen I called them again on the 29/07/19 and they then said purchase that are made with debit/credit cards take 14 working days to clear and that my money should be refunded within the next two days of which did not happen! This morning 14/07/19 I went to FNB to enquire about the pending transaction and I was told that the merchant is yet to process the refund, when I called TFG again they told me that the matter will me escalated to their finance department . As it stands I still haven’t received my money and it has been a month of waiting. I am really frustrated and disappointed in the way the have handled this matter, why is it that they were able to process the transaction in a split second but they cannot do the same for my refund?!!!