Have you contacted them? How much money did you have in your account? This is why you should not keep all your coins in an exchange, even though I'm not following my own advice. Poloneix is a top exchange which is why I'm asking if you contacted them, since they should be able to help you out.
Re-read what he said dude. He already said if he has ~0.87 btc and he already tried to contact poloniex since 3 months ago but until now he doesn't give any reply yet. Idk if that's all of his money or not, but it's more than $7000 and it think that's still huge money for people