Hi Ben,
Since your number is flagged, calling any of those numbers will continue to fail. You should try to fix this by requesting help online using the steps below:
Go to: https://support.microsoft.com/contactus
Select your product (Windows, Microsoft 365, ...) > Choose the chat or email option
Then explain your case so the agent can assist you immediately and remove the block
Let me know if you need any other assistance. I am happy to help!