i had another coin stuck on poloniex (the coin was delisted), I created a support ticket (or two, if I remember correctly), they did sync their blockchain with the network and withdrew the funds for me
but this was about a 1.5 years ago when there were less users
try again, you have nothing to lose if you spam them few times
Thank you very much for your advice. I have allready made 3 support tickets, but I won't give up until I will get my coins back.
