You're free to keep your free account indefinitely. But if you do decide to delete it, whatever your reason, it'll take you less than a minute.
The steps below permanently deletes your account––we won't be able to recover any of its information or associated data.
Go to https://settings.webex.com and sign in.
Select the ellipsis on the top right of the identity card, then click.
For further issues with your account, please contact support.