Call NY lawyers and make them act against Poloniex to withdraw Your Money.
Or simply just try to get in contact with the Polo support team to get this fixed in a timely manner without getting lawyers and authorities involved over something that is leaning towards your fault. You didn't get hacked too, you're just going to have to work with Polo (may take sometime as their bogged down with shit at the moment) and they'll probably glady give you whatever money you have back, even if it was your error that this happened.
No you didn't get hacked, yes you'll get your money back. Good luck!