Disappointed

I bought a Pineware heater on 26.05.2025, the heater was not working by July. I took it back on 03.10.2025 luckily the store manager was so kind as to replace it for me at no extra charge but my concern is this, I couldn't get a refund which I would've preferred seeing that if the heater only lasts for three months what if the replacement also only lasts for three months? And I was told that I cannot bring the replacement back for another replacement and that refund is totally not gonna happen. I'm really disappointed because if I was refunded I could go and purchase a heater that will at least last me a couple of years not a heater that could potentially only last me a couple of months based on my experience