They want to talk to the manufacturer. I told them we get them from China.
Like, seriously, who in their right mind thinks any company would give out their manufacturer's names. Why would they let you get stuff from them?
Furthermore, what makes you think they give a hot shit after the items are sold? It's not like you bought any chairs directly from them. You're not their customer, and unless you're about to buy a thousand chairs they're probably not even going to give you the time of day.
I'm surprised they're fighting this, to be honest. It's been over two years. Just accept that we're not going to a) warranty something that's been out of warranty for over a year and a half or b) give you our manufacturers name, because that's none of your GD business.