Can't believe Adobe makes it so hard to cancel a plan - quite disgusting really

Do you have an enterprise or a teams plan?

The plan can be cancelled during the renewal window, starting a month before the plan's anniversary, by using the admin console. Adobe customer support can be contacted via the admin console: https://adminconsole.adobe.com/support. You need to be an administrator to use the admin console.

If you have an individual licence, you can cancel anytime by going to your account and plans: https://account.adobe.com/plan.

Click the "Manage plan" for the plan you want to cancel:

...and cancel your plan:

If you need support, contact Adobe customer care. Adobe customer care can be contacted by beginning a secure chat session at https://helpx.adobe.com/contact.html?rghtup=autoOpen. Pop-up blockers need to be disabled! If the chat window fails to open, or is non-responsive, use a different device to start the interaction.
Support phone numbers may be found here: https://helpx.adobe.com/contact/phone.html. Please note that phone charges may apply.

(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here
https://community.adobe.com/t5/account-payment-plan/how-to-contact-adobe-support/td-p/11843852)