I wouldn't worry at all about Poloniex. They are the most trustworthy exchange in my opinion and I don't think there's much competition for that title.
Just submit a ticket or go on IRC and get some assistance. They always come through. They even fully paid back people from when the security issue back earlier this year. How often have you seen that happen? Most of the time in this space people just disappear.
Could you point me to their IRC ? I could only find one where no posting is allowed.
As for tickets... I really wish you never need to use one. It's been longer than 2 days and no response. Actually, reading some posts, seems that people are waiting weeks or months... That brings the question what good is it to have you problem fixed after moths ? Those funds might be needed a lot sooner than that.