I lost 50k on this site, when I pay with small amount, everything is fine, after I transfer more to the site, all sudden they block the account (no email, no reason, uncontactable), my god, it's scam.
try verify your account and then withdraw all your coins and never use that exchange again.
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can be an internal work, probably some hitbtc staff may have taken your coins and made trade with your coins, if they did not respond you should proceed with legal actions, you can hire a good lawyer, report your case to the police and let apolicia and the courts find these hitbtc scammers.
@OP
wait until they verify your account and then if you can not withdraw your NEO then proceed with court action, hire a lawyer and report your case to the police. you also diversify the exchange, never use hitbtc that is anonymous, never use yobit that is anonymous, use binance, kraken, even cancer d bittrex may be more useful, but never put a lot of money into a never exchange, diversify the exchange and do not put a lot of money in exchange