How to change plan?

We were using three editor seats, but we invited them to the Figma project as we started collaborating with an outsourcing company. Now that the project is completed, and we are only using three editor seats again, we no longer need the organization plan. How can we switch back to the professional plan? and didn’t remove they permit 5~6 month ago…
can i get refund?

This is a community forum. You need to reach out to Figma team.