The old "10 day pending trick" I suspect.
It happened to me, and they will lie their way out of it.
You seem to have all the symptoms
Diagnostic test:-
Check your account "Cashcheck" history to see if withdrawal is still shown as "pending" long after it would normally have moved to "in progress".
On day 11 (that's working days), it will move to "in progress" of it's own accord whether or not you have gotten anywhere with CS or Andrew, and should be paid by day 12 (Instantly showing if eWallet, might take a couple more days if bank account or card.
If you win again, your bonus offers will vanish.
It appears to be something that happens to players who win and end up ahead overall, ones the casino feels are "unprofitable" over the long term.
Voting with one's wallet is the best option, unless you are prepared to tough it out for 10 days each time you withdraw.
They pulled out of the UK, so no longer a concern for me.