Should be OK provided you have read ther terms with regard to your eligibilty for this bonus, which you seem to have had confirmed from CS in any case.
I have played there as a VIP, and would rate them as "proceed with care" as you do have to be aware that they employ a fair bit of marketing trickery that can lead the unwary into breaking the terms.
The pending period is 48 hours, and verification should not be a problem since you already have accounts at other casinos in the group.
Between claiming new player bonuses at their casinos, you are expected to demonstrate a willingness to play without a welcome bonus, and this can be served by making some additional deposits into your existing accounts between claiming sign up bonuses, perhaps even using the regular promotions with tend to be around 15% to 25% on deposits, which appear in the rewards account, rather than the casino.
If you are concerned that they have locked you out without telling you, check that you can redeem reward points before making further deposits or signin up at another of their casinos.
If your rewards account is locked, uninstall all their casinos and play elsewhere. Wait for them to contact you, and tell them you stopped playing because you encountered problems redeeming your points, and that you have been playing elsewhere.
If they want you back, you will find your rewards account gets quietly unlocked, even though officially this "cannot be done manually".
Their licensing jurisdiction has become quite player friendly, and casino rewards has received a few raps across the knuckles over confiscated winnings, and been forced to either reverse the decision and pay up, or reach a compromise based on shared fault.
They have no desire to become accredited here, and it is their company policy that prevents them having a player rep, leaving Renee the affiliate rep who will pass on player complaints to the relevant department. It is also possible to PAB against them under the "one shot rule" (one PAB per member for a non accredited casino). Further PABs may be considered, but this is at the discretion of Max and Bryan. New CM members are expected to learn from experience after getting burned once, and stick to accredited casinos.