Jacobien Wouter Of course you should be getting a notification. You can see the flow described here: https://together.bunq.com/d/18137
There was a small period a while ago where these notifications haven't been sent out correctly, and this might have affected both of you. In this case you can order a replacement by yourself. It's still free of course, you don't need to pay additional money because a notification didn't work.
If you have followed a flow in the app in which you ordered a new card instead of a replacement, it could happen that you got billed for the card, because the system recognizes it as a new card. In this case, support can help to refund the charge.