Best way to effectively ban and hide someone, including SSO

I am using Single Sign-on, where the account is created on a WordPress site and then it connects to Discourse.

I recently had a spam user sign up to promote their products. I want to delete the user, but am not sure the most effective way to do it, because surely they would just sign up again.

Is there a good solution to this that will keep the email address banned from creating a new account?

Would that need to be a WordPress plugin?

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