You never sent BCH to Poloniex. You never bought BCH on Poloniex. Poloniex never promised anything regarding BCH. I don't see how you could win that case.
Just like in my case .... poloniex is holding the withdraw order back .... which i did around 25 hours _before the planned split time_...
So, in effect, as long as poloniex does nothing to reimburse my potential loss, they made me a problem by simply doing nothing....
But anyways, according to the last press release from poloniex ... they're planning to at least pay out all BCC which are correspondent to the local wallet values a user had at the time of the split..
Which _SADLY_ does not tell me, what will happen with my coins still in nirvana, erm, in transit...
Mhm ... well well .... i had so much patience over so much time..... Waiting another week to hopefully get my btc "back in business" and probably the bcc i should have right now is frustrating and sad .. and even makes me additional losses .... but it's just a week from now...... (or 10 days even...)
Hacky