Makro is ***********, won't refund me my money.

I bought an inverter online. When it arrived, the instructions manual said that the inverter must be charged for 24 hours before we switch it on, which is exactly what I did, however the inverter did not switch so I decided to return it within 5 days.

The inverter was then collected by the courier people, after that I didn't hear anything from Makro but they kept taking the money via pay flex. I followed up on a number of occasions with success, until I decided to go to Makro at Strubens Valley for assistance, they promised me that they would assist within a few days but in never happened. I spoke to Matshidiso who tried to assist but she couldn't do anything, she informed me that the supplier has rejected my return and will not refund me. Apparently the supplier said that the machine only works with batteries and I don't want that because that makes no sense...I mean if it only works with batteries why was I instructed to charge it for 24 hours before switching it on? I no longer want the product, however Makro is not cooperating with me in this regard, they've been quiet and are ignoring my messages and emails. The supplier tried to return the product to me but I told the courier guy to take it back to them and I've not heard anything. What can I do? What legal options do I have in this matter? I just want my money back, I will not accept a product that doesn't work, one that I'm also not happy with.

Please help.