Chances are you will need to contact Adobe Support directly.
Look thru the following links and use the chat/phone option if required for your situation:
Cancel your membership or subscription | Creative Cloud
For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat option...
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.
Creative Cloud support (all Creative Cloud customer service issues)
http://helpx.adobe.com/x-productkb/global/service-ccm.html ( http://adobe.ly/19llvMN )