IStore failed to refund my money

I went to buy my son a gift at the iStore in Canal Walk. I paid using my FNB cheque card. The transaction went through and I got the SMS confirmation. However something failed on the iStore’s system. The sales assistant and a manager told me they were going to phone to reverse the transaction. This turned out to be nonsense later. I then phoned FNB who told me that the iStore had to reverse the transaction. I went back to the store and asked for the FNB reference number from the store manager. Inagine my surprise when he told me they did not have the number! So the first 2 employees never phoned. Nevertheless the second manager told me to just wait a few hours as their system would issue the refund. You know the rest. No refund has been received. I am out of pocket a day before 2 public holidays. To say that iStore’s service is execrable would be to insult faeces.