You can cancel Google Ads from the control panel.
- Log in to the control panel and click Google Ads.
- Click the red garbage bin icon on your dashboard.
- Click Approve, to confirm your cancellation.
The cancellation will take effect at the end of the billing month, the period that you have paid for. Your campaign will stay active until that time.
Tip: You can always reactivate the campaign again later, without having to go through the setup procedure again.