Refund

Good day Last year december i purchased an airfryer at Game Soshanguve Crossing, 4 months later the product stopped working and i took it back for repairs and was given a new one. Exactly 4 months later again, the new one stopped working exactly same problem like the last one. I took it back and requested a refund as the brand i chose might have been the problem. I took ot back on the 3rd of November and was promised to be called back for the outcome of my problem, i called the shop several times last week and always told someone will call me back till Thursday when the lady who answered the phone told me to come to the shop to receive my refund. I went the following day, which is Friday and only to be told i cannot get a refund but rather a voucher. The voucher for me won't work as i don't need anything from Game store and with that means i now lost my money??? I called the call centre and still nothing was promised. I asked if the voucher could be atleast for Makro store as they are the same massmart/rcs and still my request was not promised anything. I need urgent help in this matter as i don't think i should then loose R1690 just because I'm now forced to again purchase either with Game or i don't get my money back.