A forum posting is not contacting customer service - use chat or telephone. These are user to user forums wherein no one has any ability to cancel a subscription... not even the Adobe employees that visit.
Phone support | Orders, returns exchanges
http://helpx.adobe.com/x-productkb/global/phone-support-orders.html
For the link below click the Still Need Help? option in the blue area at the bottom and choose the chat option...
Creative Cloud support (all Creative Cloud customer service issues)
http://helpx.adobe.com/x-productkb/global/service-ccm.html ( http://adobe.ly/19llvMN )