Banks sometimes just take their time with these kinds of checks , patience is unfortunately part of the game.
Personally, I’d give it another two weeks. If still nothing happens, I’d send them a registered letter with a 14-day deadline to sort it out.
If there’s no response or explanation by then, I’d get a lawyer involved and report it to the Dutch financial complaints body , I believe it’s called Kifid.
In the meantime, I’d use a different bank︀ account to receive your other payments. And honestly, might be worth thinking about whether it’s︁ still worth staying with YourSafe.