Luckily my mailboxes where empty just moved 4 banned characters onto a different account after I got hit with the ban, if you can do this do it now.
Not sure if this actually works, but transferred my rogue over to another account on the same bnet ID. The payment went through and the char is pending. EDIT: And this is on an account that was just hit with the ban. Ill let you know if it works or not.
Just tried to do this, says I have a heirloom in my bags or voidstorage, which I am 99% sure I didn't. Anyway to delete items from bag/bank from the mobile app or something?
The other option is to find another game or activity and stop giving Blizzard your money. That's what I'm going to do.