Mark @ Everlast
Advertiser
You know what works really well? Go to the store you bought it from, mumbling about getting all their business addresses, etc for the small claims action you're going to take, because they are the local representative of the manufacturer.
Actually, the manufacturer is probably trying to bluff you. Ask them to define what over firing is, have them show you in the manual where this is discussed, warned against and defined; and ask them how they prove you over fired it.
Do it all by letter.
They'll wilt
I'd be willing to bet that over firing was in the manual. I've been around a lot of wood stoves. Everyone I have seen says it. Even my fireplace (prefab type) says it in it's instruction manual....warns of cracking brick etc if too large of fires are built. And from the looks of things, there's been a few hot fires in that fire place. The best thing to do is repair it, reinforce it if possible, and forget about it until the other side does the same thing.
It wouldn't be too hard to prove overfiring, by looking at stress on some metals, consumption of others, and even discoloration in hidden places. They probably could prove it if pushed, IF that is the case.