A. It may not necessarily get you a perma ban at all. They may very well just ignore the email and possibly block your address so they won't see your emails again, but not ban you.
B. Uh, are you saying would you get arrested for saying swear words to a company through email? No. And no, you wouldn't get sued, either.
I'd say it's totally pointless. Once the ban is over just immediately use a Warden-detected program.