To close your account:
Login to this support portal if you haven't already.
Navigate to Products & Services > My Services
Click on the service you wish to cancel then click the Request Cancellation button.
Once an account is cancelled you will no longer be able to login and all data associated with the account will be permanently and irrevocably destroyed. This includes all campaigns, contact lists, subscribers, templates, API keys, landing pages, surveys, and all other user data. Once the data is deleted, it's gone forever!
If you need to export your subscribers see: How to export your subscribers
