To remove ClickSambo's OAuth access from your Google Ads account:
Sign in to your Google Account (myaccount.google.com) using the Google account linked to Google Ads.
Navigate to "Security".
Scroll to "Third-party apps & services" and click "Manage third-party access."
Locate "ClickSambo" in the list.
Click on it, then click "Remove Access."
Confirm the removal.