Black Friday Refund

I purchased a pair of shoes on the adidas.co.za online store on the Thursday 23 Black Friday sale. Order number ********** 19. The discount code app**** to all online orders. The website showed a size 10 shoe was available, I selected the shoe size and proceeded with the purchase discount. I was later emailed to inform me that the size I had selected was not available and that I would be given a gift voucher for the amount that I had paid. I do not wish to use the gift voucher, since it was at Sale price and not full price. The website was unable to offer me alternative shoes in another colour (also shown on website as size 10 available). Since "this item was not on sale at the time". I requested a full refund and it was confirmed that it could be done. 2 weeks later I have still not received either a full refund or a gift voucher. Adidas service email account has not responded to several of my emails for feedback. The service is pathetic. I have since purchased my required shoes at another online store, at less than the "black friday" promotion price.