Have you checked https://help.figma.com/hc/en-us/articles/360039820114-Manage-email-address-or-password?

Not helping.

CONTEXT: We are a team of 3 designers. One of the designer has left the team and we are two of them now. The professional plan that I have is charging for 3 design seats. As the Figma space owner, I want to remove one access now. I tried removing the access of the designer but still Figma is charging for 3 designers.

This would be the exact context of my issue. Please help me how to remove one of the designer’s access from my space…

That’s an entirely different post now! 😃 Thanks for putting the effort in describing the exact issue you are facing.

Unfortunately, Figma makes it very easy to give your money to them but hard to return or cancel. The forum is flooded with posts like yours. Figma can’t help on the community forum, you need to reach out to support: https://help.figma.com/hc/en-us/requests/new and wait for a reply, which could take a while… (about a week)