Please return my money!

I recently bought a fridge from Makro; the service and delivery were perfect. However, when I paid for the fridge on the 20th of November, my bank said that the payment had gone through, but Makro said that the payment was unsuccessful - at least 6 or 7 times. So I got a friend to make the payment for me, and after hers had gone through Makro said that mine had also gone through. So I cancelled my order for the fridge and paid my friend for ordering it for me. I have been waiting for my refund since then. I've written emails and submitted a request, but apart from saying that they have a backlog, there is no indication of when they are going to return my money.