No refund after one month and complaint

After more than a month I am still waiting for a refund on a product they did not have stock of. My first purchase showed "in-stock" online, so I paid, and then they contact me to say they don't have stock and can they issue a voucher to use on another product. I say fine. Then I use the voucher to purchase a different brand of the product, and again it says "in stock". Again they contact me to say there is no stock, could they issue a voucher. I say no, it's wasting my time, rather refund me. That was on 11 May when I corresponded with and sent my FNB bank details to Roshin. Two weeks later on 29 May I get an email saying a voucher has been issued to me. I immediately email them and say this was not what I asked for. They say they have to escalate it to management. A week later still nothing. It's now 16 June, more than a month in total later and I still haven't received my refund for Ticket [#31969] of R305. Be careful. They are *****s and give bad service.