If you wish to cancel your ecobee subscription(s):
ecobee Haven / ecobee Air Filters: Self serve at https://subscribe.ecobee.com under Account and Billing.
SmartBuildings: Self Serve at sb.ecobee.com under Account.
Please note that once a cancellation is processed, your subscriptions will continue to function until the end of your term. Any credits on your account will expire at the end of your term and are not redeemable.