First of all, I hope you are in the right place. I mean https://cex.io
Here is so much phishing websites which trying to fraud CEX users



Did you KYC verify the account before or after withdrawn attempting?
I use this exchange for along time, every time when I have a problem his support answer me very fast, almost instantly.
Also, did you try to contact @CEX here? I saw that they often respond here and trying to help. This is his official account: https://bitcointalk.org/index.php?action=profile;u=148073
On his status page https://cexio.statuspage.io there is no known incidents.

Well, that's your answer then. There is no point sending them more emails or support tickets - you will just have to wait for them to complete their "compliance review". Unfortunately, centralized exchanges spring this kind of behavior on their customers all the time - they let you deposit, let you trade, but then as soon as you try to actually withdraw your money from their platform, suddenly there is something suspicious about your activity and they need more information. Have you deposited or tried to withdraw to somewhere like a casino, betting site, or a mixer? Often exchanges will flag you up for that. If you haven't completed KYC yet at Cex, then I would expect that they are going to ask you to, and you will have to decide whether to give up your personal information or lose access to your coins.

Even without using fiat, centralized exchanges still like to police their customers and decide what you are allowed to do with your money. To avoid situations like this, I solely use decentralized exchanges.

In which case, the transaction is in Cex's queue and has not yet been broadcast. They may be waiting for a sufficient volume of withdrawals to batch together, or they may have other internal factors going on which is slowing down the process, such as the recent spike in transaction fees and backing up of the mempool. I would also check your email and make sure they haven't seen you a notification saying they require additional information, KYC, 2FA code or something else before they will process your withdrawal.

There is nothing anybody on this forum can do to help. The only people that can solve this is Cex. If their support is not answering your messages, try reaching out to them on social media: https://twitter.com/cex_io

Is this your first withdrawal from CEX ? Is your transaction still pending on CEX ? Or nothing showing? If the transaction isn't appearing on the block explorer, it does mean CEX didn't broadcasted the transaction yet. We are unable to help on this case and only CEX could help you. That's what the problems with centralized exchange.

Anyway you can check on web version if transaction still pending for some reason. I have never used it before, so try to contact with support or mail them. Otherwise try to contact via there social media, there is no other option.

I have messaged Cex support team more than 19 times and no response whatsoever.

What could be the problem ?

19 times!

Did they confirm a txid with you on your withdrawal and did you check you gave them the right address (if its on a confirmation email).