Certification bodies

We are located in Eindhoven - NL. Our primary business is providing a SAAS solution, we work with an 27001 certified hosting partner.

Answer: I'm assuming you are referring to certification bodies instead of auditing agencies. Considering that, we do not know Netherlands market in details to recommend specific certification bodies, but you should consider these references:
- SGS https://www.sgs.nl/en
- BSI https://www.bsigroup.com/nl-NL/

To help you selecting an certification body, I recommend these materials:
- How to choose a certification body https://advisera.com/blog/2021/01/11/how-to-choose-an-iso-certification-body/
- List of Questions to ask an ISO 27001 or ISO 22301 certification body https://info.advisera.com/27001academy/free-download/list-of-questions-to-ask-an-iso-27001-certification-body