Poloniex froze my coins (BTS) and won't reply to support tickets. Wilmington Delaware

Earlier this year I succesfully deposited nearly 20000 BitShares (BTS) on the Poloniex exchange. Without warning they shut down the wallet and the ability to sell, buy, withdraw or deposit BTS. The following message has been coming up when you enter BTS on the exchange for the past 5 months:

"BTS is currently under maintenance or experiencing wallet/network issues. Deposits and withdrawals will remain disabled until a solution is found, which may require an update from the BTS team. Any updates must be tested and audited before enabling."

I have created several support tickets without them answering. They have been completely silent on the BTS situation publically. The BitShares Foundation has also reached out to Poloniex and offered their assistance, but Poloniex has refused to answer.