Your coins are unmoved still - which means they technically didn't steal your coins, but this case is a shame. Poloniex as an exchange with many years of experience should have fixed this in a maximum of two weeks - and yeah, that is already way too much time for such an easy task.

At least you can rest assured, no one touched your coins yet. They just seem to be unable or unwilling to fetch their private key and fix your issue. In no case that would be okay.