Dont know if this is the right place to report this. but if reported bugged quest in the past via in-game petition, and never got anything replied to.
I have the quest: LEdger from tanaris (Complete) and i go all the way to tanaris from searing gorege (where it started at) to do the turnin.... and nothing... the quest npc is still grayed out... even with the quest complete in my quest log. please help.