What happens if the number of unique users exceeds the number of unique users for the plan I am subscribed to on ZohoLandingPage?

What happens if the number of unique users exceeds the number of unique users for the plan I am subscribed to on ZohoLandingPage?

What happens if the number of unique users exceeds the number of unique users for the plan I am subscribed to on ZohoLandingPage?
Example: If you are subscribed to the Professional plan, but the number of unique users who visited the page you are operating exceeds 30,000,
→You will be charged automatically and the add-on will be applied.
→The page will not be displayed to new users even if they visit the page because the number of users has exceeded the contracted number.