This is not good. I think I might help you with it, how much is the transaction? If it is too big I can't help.
My idea is to sent bitcoin equivalent to your transaction to escrow, I will handle myself with your account. I know a few people who will solve this.
the amount is about $3500
let me know if you can help.
Maybe we should start some poloniex record time thread, here's mine:
Poloniex, you're doing great job, thank you!
http://i.imgur.com/M9wMDd5.png