This issue of Stake regarding account limit is always happening on many occasion in the past based IIRC. Stake never give a clear answer to this issue until it just forgotten by the community since no official representative anymore dealing with the case.
The latest issue that has similarity on this case was this one
https://bitcointalk.org/index.php?topic=5487225.0 but there’s a lot of account limit complaints in the past that still unresolved.
I think there’s nothing to do here except withdraw the balance immediately since the bet limit is obviously set to stop user to play anymore.
I accept your suggestions to the ops as regards withdrawal of the remaining balance from stake since his account is placed on bet limits.
But then we need to commend stake and other gambling site's that limits gambler's account, because from what I read about why casino limits player account, it is to help the players that are betting to much to avoid addictions, and possible uncontrollable loses, so the site place limits on such accounts to help them.