I have seen many situation as you before OP and those experiences were from known exchanges a few years ago. Lucky those people that have been helped by the team to receive the wrongly sent bitcoins to omni layer/protocol.
But this time, it's hard to reach and make the exchange do the favor to you and might just say that it's your fault.
Hi, thank you for your reply. May I ask you why you think that exchange now may say me it's my foult ?. May you explain this a little bit? Is it about of Poloniex company or about of me ? Thanks..