Can't purchase the black friday CC plan

https://www.adobe.com/uk/offer-terms/cc_full_special_offer.html?promoid=R3B5NZKF&mv=other 

"Offer available to FIRST-TIME subscribers of Adobe Creative Cloud All Apps "

No double dipping.  Black Friday deals are for first time customers for 1 year only. 

After that, you pay the regular price.

read the fine print which generally stipulates a first time subscription.

in any case, you should contact support because you're probably facing an early cancellation fee.

use a browser that allows popups and cookies and contact adobe support by clicking here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human

p.s you can also use phone (but chat is usually quicker), https://helpx.adobe.com/contact/phone.html

p.p.s. you can also use twitter to tweet @AdobeCare

p.p.p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative. ie, double check for an employee badge if contacted in the forums and look for an adobe.com domain in the email address if you click reply to an email. then check again and be very suspicious. any other method of contacting (or offering to contact you) is almost certainly a scam, https://community.adobe.com/t5/using-the-community-discussions/staying-safe-in-the-adobe-support-community/td-p/12919684/redirect_from_archived_page/true