My free trial ended and I forgot to cancel. I do not use this service. The automated system blocks my cancellation due to a failed payment. Please perform an administrative cancellation to close this account immediately and waive the balance.

Only you may cancel, and you must update your account to be able to cancel

This is a public forum, not Adobe support... other users can't see your account to help
This is the correct way to contact support
https://helpx.adobe.com/contact.html?rghtup=autoOpen

- and enter AGENT in the box asking How can we help you?

Hi ​@nikki1188 - I have moved this question to our Accounts forum, as they’ll be able to better assist you with billing and account-level specifics.