Since you're likely capable of it, look for some lawyers that deal with digital solutions and cases in your country. They are likely to help you file some cases or make a demand to cex.io to expedite the process that your funds are dealing with.
This is their profile (https://bitcointalk.org/index.php?action=profile;u=148073) they're replying to the accusations that are thrown at them, maybe it'll help if you to contact this account.