Your character is probably still there in the game database, but they take them off of the public Armory if you haven't been paying lately.
I played vanilla, then took a few years off. None of my old characters were listed. I don't think there even was an Armory back in those days. Later, I reactivated for a two-week trial and then my characters showed up once I started playing again. Screenshot the pages if you want to see them after your sub runs out.
In your case, you'd have to track down whoever has your account and maybe re-activate with a Scroll of Resurrection.