I have no way to contact with them. the ticket system is so slow and their twitter account literally publish one sentence a month. They refused to gave users free steller lumens airdrop. Now I don't know if they will give us BCC after Aug. 1. any ideas?
I did not hear any poloniex information about bitcoin division. So, do not risk if they do not answer you. Currently, bittrex is the best place to store bitcoin. They accept the risk of bitcoin when it's split, so you should use it.