Warlock- can't get green fire with codex of xerrath

Hi,

I am a warlock 120. Bought the tome of the lost legion at the AH for 35k gold.
I opened the book, took the quest, summoned my demons to translate the pages then went to Karosh, my trainer in Orgrimar. I spoke with him and after… nothing. Nothing in my inventory, no more warlock quest and still normal fire skill… I spoke with Blizzard support and they can’t help me much… Basicly, they tell me to get some help somewhere else.

I have unable Addon, relog many time, waited 2 days… nothing yet.
I can’t abandon a quest to get it back, since i have no quest… and nothing happens when i speak with Karosh.

Well, thanks for your help guys… waiting to hear from you to solve this problem that gets annoying.