Hello guys,
I just wanted to update the thread about my issue. Still haven't heard back from CEX it has been more than 9 days since I contacted the support and no answer till now.
Definitely they do have poor support system. It makes no sense at all.
Waiting...
They will definitely ask a full copy of personal documents before processing your request. Cex.io has been a well-known crypto exchange for Ukraine-based crypto companies but they have slow support after the increasing popularity of crypto investment. No worries, the support team will reset the 2FA even if you have no access to the lost phone number/email/authentication app.