Sounds horrible, so that was the answer you got from NA support on the matter?Yes me. From Amazon.
Short answer - You're fucked.
Long Answer - SE's shitty account system does not allow you to enter a full purchase CE code into an existing service account so you either have to make a new account (which will not gain access to any of the CE items and characters do not transfer over and early access /preorder items do not cross over) or bend over and buy the 20$ digital CE upgrade for your existing account and sit on a useless non-refundable $50 CE code like I am doing right now.
Long ass thread about basically this issuehere
I can just sell the CE addition to a friend for 20 bucks when they go to buy the game. It was my backup plan.