Bad product plus bad service

On the 18th of August I was so humiliated by the Game Gateway staff members who refused to take an ALVA Heater I bought from them. Their argument being that the warranty is 1 year but I should have opened the heater within 2 days instead of keeping it for more than two months.

The heater was a gift bought on the 8th of June and delivered to me without a slip. I kept in the box for a few weeks because I couldn't assemble it. I also noticed that it was badly packaged and some parts were bent, I didn't make a fuss I got someone to assemble it for me. Whe it was nicely assembled we struggled to switch it on and noticed that it's got a broken piece that makes it not hold the lever for gas to come out. I then requested the slip from my brother who had lost it. We had unrests in July before he could give me the slip. I reminded him afterwards that we need the slip more than ever as I won't be trusted.

He went to Game, then he asked me for the barcode , which i sent then they said I could bring it. So all these events happened and they say I broke it, what if the guys who assembled it broke it? Why did I keep it for so long? The warranty doesn't cover broken parts yet they packed the heater badly.

I told them I'd call ALVA and that's even worse because they never pick up their phone.