This is an open forum, not Adobe support... You need Adobe support to cancel a subscription
-start here https://forums.adobe.com/thread/1703848
-or by telephone http://helpx.adobe.com/x-productkb/global/phone-support-orders.html
--and two links which may provide more details, if the above links don't help you
Thanks for taking the time to provide the links, which I was able to read before I made the post. They seem to all lead to the same final option, which is the "Still need help? Contact Us." contact page with only the phone contact option.
The question that might help others in the forum is about how to cancel an annual subscription when it's not Monday - Friday before 7pm.
I believe it is not possible.
The cancellation via support can be done by chat option, were you unable to contact via chat too?