Bunq
Questions & Answers

Here you are +31208083666. But I think you are not supposed to call on their phone number to ask about their services. Only if you have an emergency situation with your card or account. Like if your card has been stolen or your account was compromised.
For all the routine questions there is a live chat and email. Use them instead.

If you don't have something super turbo urgent it is better to chat or send an email, they answer very quickly but in case it's urgent you can find it in their web page.