Refusing a refund and delivery

I purchased a USB interface from them late September. Nearly 2 weeks later I noticed that the amount for the interface was back in my bank account, so I phoned to ask what happened to which I got "The supplier is out of stock and the product will only arrive in a month+). So I opted to cancel the order instead (since the money was already back in my account), and was assured and confirmed that my order was cancelled, so I thought everything was good.. A week after cancelling I noticed the amount was missing from my account again. So I phoned to which I was told they would get information and sort it within 3-5 working days, insuring my refund would be processed. After a week of waiting and no sign I phoned and asked to which I was offered to look at a similar product on their page which the closest option is R2000 extra, and I'm not spending more money than what I wanted. So I was then ensured again that a refund would be processed. And so this process carried on throughout the whole month of October, and still to today. I am currently speaking to Robyn and requesting updates every Monday and Friday to which I get the response "I assure you it will be sorted before the end of the week" or "it will be processed in 3-5 working days for sure". This is crazy, I'm left here with no money, and no interface. Theft anyone?

Original date of purchase: 11 September 2019, current date without anything: 31 October 2019.