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.

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.

Hi, I'm facing a big trouble on hitbtc, it shows 'currency operation not available', all my money blocked on this site, it's all I have, i feel so tension by now, almost getting crazy because of this matter, please clue how I can contact hitbtc... I tried to send email and support ticket, no response, and no telephone number available...  what to do???