There isn’t an option to not resolve “you’ve reached your billing limit and now storage charges are exceeding it.” You can resolve it by unceremoniously dumping the user data. You can resolve it by… continuing to charge the user, and holding their files hostage until they pay the back storage charges, and then the egress fees (so, it isn’t really a limit at all). Or you can resolve it by just giving the user free storage by some other name.

Just saying that there should be a limit is not an explanation.