If you have already added Mailchimp Pro on your account, you can remove it from your account. Keep in mind that in doing so, you will immediately lose access to it and your Mailchimp account will not be synced.
Once you have removed the Mailchimp Pro extension, you will no longer be charged for it.
To remove the extension:
1) Go to the main navigation in your MoonClerk dashboard and click the Account dropdown menu
2) Click “Settings” from the dropdown menu
3) Click Add/Remove Extensions
4) Click “Remove” on the Mailchimp Pro extension
5) Click “Remove Extension" to confirm the removal