Yorick Bruins Hi Yorick, welcome to Together!
That's unfortunate to hear... Are you yourself also a bunq customer? If so, I recommend you to contact bunq support: http://together.bunq.com/d/32181
If you use the SOS support feature at the bottom, you'll receive a response within 10-20 minutes: https://together.bunq.com/d/44000
Please change your bunq security code and check if you're seeing any devices you don't recognize in the bunq settings (Profile > Settings > Security & Settings).