poloniex is a scam exchange now. It is very obvious they are selectively scamming their customers. Anybody that says otherwise is burying their head in the sand.
I don't think that they are scamming directly, however there have been numerous reports that Polo has a lot of issues lately, similar to this. Actually, not only Polo but other trading exchanges as well. If the account was really hacked then I don't that that OP can get his funds back. That's why we are told not to put all your funds in a exchange because you don't have control of your private keys, and if you don't control them, it is not yours. I suggest to the OP that the only thing he can do is to call the attention of Polo, but I don't know if Polo will return his fund, the chance of it happening is very small. I'm sorry to break you the news.