2400 down the drain

I made an online purchase of 2 heaters at Leroy Merlin on the 26th of April and the first heater, which was a fireplace look electric heater was delivered on the 28th of April. On the 25th of May the heater stopped working, I called and reported the heater and was told that I would be given a refund or an exchange of the same heater. I told the lady I spoke to that I didn't want a refund but would rather get the heater exchanged. The following day I received an email and a request of the pictures of the heater and I sent them. I later received an email saying the heater won't be exchanged because of the 7 day return policy of which I knew nothing about. I'm really disappointed with these guys because to me this means I just threw 2400 rands down the drain for something that is of no benefit to me. I'm really disappointed and wouldn't recommend them to anyone because they do not treat their customers with care. The last correspondence from me to them was not even responded to.