I had 2FA on Poloniex. Couple days ago I changed smartphone, setup 2FA with recovery code but Poloniex does not accept codes anymore :-(. Sent a ticket to support 2 days ago. Just silence no reaction.
They are never going to reply to your queries in there, so do not hope for it, and if you had funds on it, well, you have already lost them all.
That is why 2fa is risky if you do not copy your KEY on a document, or if you simple do not write it on a paper. If you get stoled, and you do not have a copy of that, then it is easy, you lose everything because of your bad luck.
There has been a lot of people waiting for months only for a simple reply of their tickets, and they have never been answered.