Also, just ask Badspot to change your 2K's email. Worked for me.
Well, funny story. After Badspot mentioned the seller was different for that ID, the thought came up that I could've looked at the wrong purchase receipt (I found two from Blockland: one my old ID, one saying invalid). I decided to use that key algorithm for the five characters, and of course, it's the ID I bought for a friend awhile ago. Which somehow got deactivated. I just searched the receipts for Plimus and found the right one.
That happened awhile ago, but I was just going to let this topic die.