The key to cancellation is making contact with Adobe Customer Support. They don't make it easy to do that for some reason so be patient and keep trying.
Make sure you are logged in to the Adobe site, have cookies enabled, clear your cookie cache. If it continues to fail try using a different browser.
For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat or phone option...
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Apologies for the poor experience.
Your Creative Cloud subscription has been cancelled.
Can i get some help canceling my account as well?
I've been Stuck in this Loop for 2 Hours now.
Unless you can get an Adobe employee to step up and help, you need to follow the information I provided and get in touch with Adobe Support directly.