Login does not recognice my Dawntrail Installation

[Rhysolin]

After emergency patch this morning I tried logging in and the game is telling me I can't play my level 100 character because Dawntrail is not installed. I have played through most of the expansion and have tried to find a way to reinstall my purchase but can't. I tried using the code I received on purchase but it tells me it has already been used. What do I do now?????????????????????