Look at Badspots server.
Been banned from there for a few years now because, back then, my clientside ignore script didn't have a functioning unignore. When I tried and failed, I said "crap, I can't unignore" and was suddenly perma-banned for "Because your chat mod fails" or something. On the day between v18 and v19, I asked Badspot directly if I could be unbanned. To sum it up, he said "No."
My point: I'll never know.
