If you no longer need your Poliigon account and want it deleted along with any associated information just login to your account, browse to My Details, scroll to the bottom of the page and click Delete Account.
Please note:
Deletion of your account is permanent and you will no longer have access to any assets or invoice history associated with your account.
You cannot delete your account if you have an active or paused plan. You must first cancel your plan before your account can be deleted.