Makro centurion failure to give me an exchange for a fridge

I've asked for an exchange and it's been close to 2 weeks and now makro is telling me that I can't exchange a fridge because I bought it online, so my reason for an exchangeit'sbecause it came with some faults. Half my grocery is now rotten because I was expecting to get a new fridge sooner. Now I have to wait for 7 more days to get a refund whereas they can just bring me a new fridge today since they have stock.