Correct me if I am wrong here, but you've actually completed your KYC, both level is verified, and what's under review is your withdrawal request? If that's the case, then Shuffle's hand is also tied. The one reviewing your activity is their gaming provider to ensure that they're won fairly. Only the provider knows how long.

As long as you bet fairly and didn't cheat though, I am sure Shuffle will release the fund once they're greenlighted by their provider.