I'm guessing what's going on with account is the player is transferring the account (for example, moving from something like Facebook to a regular account). I seem to recall that back in the day, this happened every once in a while.
For example, a player was deleting their Facebook account but didn't want start over. WGT would work with player to advance the person in both level and tier. That's why you would occasionally see someone advance so quickly.
The above might also explain player's post on 1/16 asking if customer service exists.He might have created the account and then contacted customer service for help in getting back to level/tier he was at previously.
Just a thought.