If you quote the entire OP, your entry will be deleted.
It's more than 72hours now I made a btc withdrawal on Cex.io and I'm yet to get the coin in the receiving wallet
First: please edit your post and remove that big quote, so I don't have to delete your post.
You can check your receiving address on
Blockchair blockchain explorer. Depending on your wallet it may or may not show up when it's unconfirmed. The next auction depends on whether or not the exchange actually made the transaction.
and no record of the transaction on blockchain network.
If that's the case, there's nothing anyone other than the exchange can do for you.
I have messaged Cex support team more than 19 times and no response whatsoever.
What could be the problem ?
The first problem is spamming the exchange 19 times. That's not how support tickets work, all you've accomplished now is pissing off some poor support employee who now put you at the bottom of his task list.