Can't take questline next part

After completeing quest [Forge Camp: Mageddon] [http://wowwiki.wikia.com/wiki/Quest:...amp:_Mageddon] I could not take next part, [Cannons of Rage] [http://wowwiki.wikia.com/wiki/Quest:Cannons_of_Rage]. What I was thinking, is that the first quest I mentioned, u had to kill mob named Razorsaw. He dropped a quest [Vile Plans] [http://wowwiki.wikia.com/wiki/Quest:Vile_Plans] giving item [Burning Legion Missive] [http://wowwiki.wikia.com/wiki/Burning_Legion_Missive]. Now after I got the first quest done, I went to turn quests in. After I completed the quest, that I got from [Burning Legion Missive] item, I couldn't get the next part to [Forge Camp: Maggeddon] quest.

Is there any1 else that has encountered such problem? Because it seems that I'm the only one with such problem. I've asked leveling players in that zone if they have got the next part, and they said yes, they have.