Consumer Protection lacking

I bought an MS 365 licence for R 899 today at Mall of Africa. In my haste to get the product key, I damaged the last numbers as one has to scratch the tape off. Apparently, I am not the only customer this has happened to. So I went back to get another card or refund to then get a new licence as I needed to update my MS licence, it expires tomorrow. Arriving at the Mall of Africa store again, I was greeted by a sombre-looking attendant that was not helpful. The other attendant actually helped me. However the somber-looking attendant and Cristian ( floor manager) said not refund is payable and that they will need to contact the supplier of these cards, it may take up to 10 days. How will I handle my computer, go figure???????