Look through the following links and use the chat option if required for your situation:
Cancel your membership or subscription | Creative Cloud
Chat support - For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat option...
if you do not see the chat option 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 )
Phone support | Orders, returns exchanges