1. To cancel any addons or subscription, log in to your account and go to your organization's dashboard by clicking on the upper right button.
2. Click on Billing from the left menu sidebar:
3. Click on the Cancel Subscriptions under the desired addon(s) then scroll down to the bottom of the page and click on Update Subscriptions button. Credit notes would be generated on a pro-rata basis for unused days and will be applied to the next invoice.
Note: New Billing UI has the provision to undo any changes, but this is before applying the changes. Once the changes to the plan are confirmed and payment is done, then you would need to modify or cancel the addon.
For any queries related to billing please contact Support.