How to Cancel Mailchimp
Navigate to the Mailchimp website and login.
Click your profile name and choose Account.
Click the Settings drop-down menu, and choose Pause or delete account.
Select Permanently delete this account, and click Continue.
Complete the exit survey, confirm your password, and click Permanently Delete Account.
In the pop-up modal, type DELETE.
Click Delete Your Account to permanently close your Mailchimp account.