you have to use Cancel your membership or subscription | Creative Cloud We here are not Adobe's employes, we are users like you and me.
Ok, sometimes you will find some of these really helpful staff members here, BUT it would be better to use contact from above.
Mr. Sunshine, As mentioned above , please use the above link to cancel the subscription in the month of September, you will be able to use it till September 23rd. The billing date is September 23rd. Your 13th renewal will be billed on September 23rd 2014.