They should definitely let you know that they can do so in the Terms and Conditions. Maybe the casino considers that they let you know just by email when you received it. It shouldn't be a stretch, but if you only had one withdrawal of €400 before, they probably didn't have to write it to you at the time and there was nothing to split.
Now that you had more withdrawals, it's not the first time I've seen that happen. It would be important to me that you get the money when the date comes.
Obviously you have to make a decision based on that if you know the casino can do it and whether you're going to keep playing after you've withdrawn everything.
As for making screenshots private, we don't have that option on the forum. So if you have a problem with that, you can edit your post and delete it.
