I have been waiting for multiple months to hear back from Vercel support about this and have been charged three times in the process. I am unable to downgrade my no longer necessary Pro account, because of an error message.

There aren't any domains, services or Integrations on the Pro account that I want to downgrade: The page for Integrations says "No Integrations Installed You don't have any integration installed."

I've tried moving the project between different Teams, even to a new account. Nothing has changed.