...
To stop billing for an advertiser or a feature clients must manually deactivate or use the calendar and schedule the end date for the desired action. All products and clients are deactivated at 11:59 UTC and the date applied to the action provided.
Deactivate an Advertiser
To deactivate an advertiser navigate to the advertiser settings page and change the status by sliding the status bar to the left.
...
Please note it is best practice to deactivate advertisers if they are not in use with active features as it will hide them from the main client dashboard.
Setting End Dates
Alternatively you can schedule advertisers to turn off on a particular day of the week/month. Simply navigate to the Advertiser Settings page and set the end date. Once selected simply select “Save Changes” and the advertiser will turn off at 11:59 UTC of the date selected.
...