Building for Professions

I got this quest after building my forge and upgrading my garrison to level 2. What I did to complete the quest is drop a profession building onto my new small plot which is all that's required for the quest. I then turned in the quest and cancelled construction on the profession building which refunded the cost. You can then put whatever you want in the spot without losing any resources or gold.

So, I have the quest in my garrison right now from Baros Alexston to build a professional building. But I already have one. All it let's me do is replace what I have and I don't want to do that. Wondering if the quest just sit there forever now. Or this this just another broken thing?

TL;DR: Per a GM, they know it's broken and there is currently no fix in place.

I have two professions buildings completely built, I'm level 100 with a level 3 garrison, and all of a sudden, this quest pops up. I now have a third small plot available, so I COULD build another profession there, but I don't need one and I want to put the salvage building there. However, the salvage building doesn't count toward the quest, nor is it unlocked for me yet. I don't want to destroy my level two buildings and rebuild them just to complete the quest. So yeah....this is very confusing. I have submitted a ticket and will update this post when I get an answer.

UPDATE: So after submitting no less than FIVE tickets (each one went unread and they just responded with a cut & paste message that said "if you're having trouble with a quest check the forums for other answers from the community") I finally got a response that said they are aware of the issue but they are not going to auto-complete any quests for anyone at this time, even though they have the capability to do so. He said that if they do it for one person, they will just get flooded with requests to do it for everyone else. The Game Master had the nerve to tell me that "it's not that expensive to tear down a building and rebuild it, so I suggest you just do that to solve the problem." So I guess we get to pay for their screwed up system. No thanks, I abandoned the quest.