Volpes, requesting CASH refund!!!

In July I bought two sets of curtains on sale from Volpes. I decided to return the curtains, as my windows are too big, and the curtains are not going to fit. On July 24th, I went to the Alberton Branch @ Newmarket Mall, where I was told, that I cannot return SALE items. I was very surprised, as I didn't know that. The lady told me, it is written on my slip, which, it wasn't, and she then showed me the small board on the till. I told her, that I wasn't aware of this, and no one told me when I bought the items on sale, that I can't return it, otherwise I would never have bought it. I was very upset, and insisted on a cash refund, which was R1300 in total. She then said she can only give me a gift card. AGAIN, what must I do with a gift card??? I don't need anything from Volpes at the moment. I can't use the curtains, which I brought back in its original packaging. She then gave me head office nrs to call. So, I emailed Volpes on the 24th of July explaining my situation. I can't use the curtains, and I have no need for a gift card. Some of the email I received back doesn't answer my query... which is... WHY??? Why can I not receive a cash refund?? The curtains are in its original packaging, not used. And R1300 is a lot of money, just to shrug it off...NO ONE from Volpes has given me positive feedback on my question. Many stores in SA take sale items back if it's still in its original packaging, not used, and not sanitary issues, so why? I feel this is against my consumer rights, especially because no one told me, listen, you are not eligible for a cash refund when you buy items on sale. I have been emailing you constantly, and you are ignoring me......I have the gift voucher, which I can't use. Please, just refund me my cash.