This is an open forum, not Adobe support... You need Adobe support to cancel a subscription
-or by telephone http://helpx.adobe.com/x-productkb/global/phone-support-orders.html
I am not trying to cancel my membership and I have tried over and over to get my partial refund through phone calls and chat to no avail.
Maybe posting in the forums will get their attention.
I'll look into this and ensure the partial refund on the original plan is processed (6 months).
You have been charged the special offer price for CS customers for the first year - $359.88 ex tax. (Regular price is $599.88)