CC student expires and update not possible

Esmeralda, you can use the process listed in https://helpx.adobe.com/manage-account/using/cancel-subscription.html to cancel an active membership. If you need any assistance with the process then, please contact our support team at https://helpx.adobe.com/contact.html?rghtup=autoOpen 

adobe won't contact you.  (and these are user-to-user forums so you're not communicating with adobe here.)

and you do need to contact adobe:  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. 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.

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

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