Amazon South Africa return policy ******* and does not work

In short ordered a Gas Hob on Amazon based on the information provided in the advert. It arrived and did not match the size on the Advert and would not fit into my kitchen cabinet by a full 12cm. I returned online and did hear anything. I followed up only to be told I must pay for the return to the supplier (this will cost almost as much as cost of the unit) and then I can be refunded my purchase. Under the NCA my purchace and payment was made with Amazon not some third party supplier and as a result Amazon is responsible for transaction. I called the Amazon help desk only to be told I needed to contact the supplier to Amazon to resolve. I did this only to be told they dont really know how this works and yes I need to return before they will refund. This is crazy and *******. I will be taking this further.