TakeAlot refuses to replace defective item

I ordered a coffee machine. The item arrived defective. I immediately logged a return. I was told they would try to arrange for the new item to be delivered when the defective item was collected. This was not done. I was told by there sales representative that they had the item in stock and once they received the defective item at there warehouse they would send me a new item. I waited 4 days. I then received a email that the item was out of stock. I checked there website. It was not. The price had merely increased (by R2000) and they therefore did not want to honour the exchange. Each sales person I spoke to came with a different excuse. They said there supplier changed and therefore could not swop it out. Why is that my problem? I bought it from them not there supplier. They should be the ones sorting me out. This is not the first time experiencing this problem. I have never complained, but this was a gift for someone. They had to send it back due to it being defective and now they are sitting without the item and to make matters worse this person sold there coffee machine they were using and is now sitting without a coffee machine. Really terrible service from TakeAlot.