Hello,
Over a month ago I transferred a character and, little unknowing me, selected an account as I had the option to. My primary account wasn’t in the selection so I assumed the “wow 1” option would be the safe choice.
Turns out the account name is the name I used back in Vanilla… 
Not knowing this, I transfered it to the wrong account.
I contacted support, they reverted the transfer, I’m happy, they’re happy I’m happy, I was still forced to wait for 30 days before I could play but whatever.
Fast forward 30 days, I do the transfer, this time I am very careful about it because I knew the current account doesn’t show up in the list and I should just not touch it.
I do the transfer, wait an hour or two, character gone.
…What? I look around and couldn’t find it. Perhaps I got an e-mail? Nope. Could it be…? I check the other account and there it is. It automatically moved to the other account even though I did not tell it to.
There goes my money and another 30 days of time. :^)