Just wait. And keep contacting support until they respond. There isn't a whole lot you can do in this situation, if your transaction is indeed confirmed. Another thing you could potentially do is reply to cex.io on twitter, reply to their tweets and tag them in it. People seem to have some degree of success with that.
Should have done your research before you deposited funds into their system, however. I've probably seen around 10 threads at least made about cex.io withdrawals and deposits being delayed for no reason.
We will try to find out what is the reason and ensure that you receive your BTC.
Still pending after so many days, I used to have my BTC sold already, price are lower now...

It is very annoying the situation that you are going through and the fact that they take a long time to respond and solve your case becomes even more worrying, you already have losses because of this problem and the question is if they will compensate you
still stuck in CEX.IO
You have to be calm and if a few days your problem is not solved, so you must create a thread in this section:
Scam AccusationsI know, but last time when I withdrawal USD from CEX.IO it took about 30~40 days to completer, so maybe they are just slow as hell, I would wait a bit more
I think this is a different issue: with the fiat I can imagine problems with the banks, but in this case, the blockchain clearly says that the transaction has got multiple confirmations. Either they are just holding back our BTC for whatever reason, or there is an issue with their software. In both cases, they are responsible for that, thus *they* make us lose money.
Still no reply and stuck in CEX.IO, I will surely not use it again after this
Yep, if you don't feel comfortable with using a particular exchange, then don't use it.