Poloniex Support isnt known for being the most responsive.
I'd recommend moving your money out of there, sooner or later it will disappaear.
Nowadays it has become a trend (due to the increased number of users) for exchanges to not respond to support tickets within a reasonable amount of time. I don't think other altcoin exchanges will do much better in this case.
Poloniex has been suffering from problems for quite a while now, which caused traders to flee to Bittrex, but this exchange in current days suffers from the exact same problems, which is a shame.
The only alternative is to make use of dedicated Bitcoin exchanges such as Bitstamp and GDAX. These are probably the very few exchanges that at least are handling everything in a much better and humane way.