If you have sent the bitcoins to a wrong address generated by the exchange then they should probably help you out on this because you have not sent the money to somewhere else but they were just sent to a wrong address, if they can really reach somewhere in the exchange then you will surely get them back.
I think if u read last 3 posts before yours, u would have understood that Polo did not generate any wrong address. It was an alt coin address, where bitcoin was sent. Now, no one has the private key. So, the bitcoins are potentially lost forever.