Quest issue

[pastbound]

Im having an issue with a quest for Arathi Basin, called "The Battle for Arathi Basin", given to you by a guy at Refugee Point.
I need the objective to wear my AB tabard. yet the quest will not complete despite me doing exactly as the quest instructed.
Im supposed to assault the Mines, Blacksmith, Lumber Mill, and Farm. Ive done that numerous times and it wont complete the quest. Help, please? I need the reward for the objective.