My thoughts are that because your situation is intricate, that crafting a written ticket explaining your account layout, and your desired, resulting layout, might be the way to go.
It is a straightforward thing for them to do. If the opportunity presents itself on one of your existing tickets... maybe go into the issue there, saying how you thought you needed separate accounts and have since learned that you don't need them all separate, and the listing which two bnets you are keeping, along with which WoW accounts you want to end up on each.
Connect With Us