If you actually begin the steps of suing them in small claims court (which after the dropping of mandatory arbitration clause, is the official dispute mechanism

If you actually begin the steps of suing them in small claims court (which after the dropping of mandatory arbitration clause, is the official dispute mechanism for Minecraft), suddenly support has no problem giving you your account back. If you bought the game back in the Notch-owned Mojang days, you have a license guaranteeing your right to access all future Minecraft versions. It's a pretty open-and-shut case.