CEX.IO is the perfect scam.

While testing them, I intiated a payout for 250 USD. After having entered all the required bank data, this dialogue evolved:

April 16th: Cex.IO "user support" asks about the bank details. I reply, which specific details further than the one already provided would be required.
April 20th: No answer yet from CEX.io "user support". I ask them again, which details are needed or if the process continues. In their status screens, the transaction is flagged as "completed, wire sent".
April 21th: Cex.IO "user support" once again request correspondent banks details. Again, I ask them which specific information they are missing which they have not yet been given from me. They apologize and state, that they will come back at a later time.
April 22nd: I order them to cancel the transaction, so that I have access to my funds again and can at least trade in BTC.
April 23rd: I order them again to cancel the transaction.
April 24th: I get a reply from CEX.IO "user support" asking for "Bank name, Adress of the bank, IBAN, SWIFT, Country of the bank"
April 30th: I once again order them to cancel the transfer. Nothing as of yet. I cc'ed the complaint desk financial authorities in GB and Estonia.

I can only strongly advise anyone, not to use cex.io and their exchange. The internet is full of stories like mine, user who have experienced tremendous troubles when trying to withdraw funds from CEX.io.