you needed to cancel during the initial 7-day trial period (or within 7 days of the end of it). here's more info:
make sure you're aware of the cancellation terms by selecting your plan type (at the top of the page here), https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html
for info on how to cancel your subscription, this page describes the few steps involved, https://helpx.adobe.com/manage-account/using/cancel-subscription.html
if you want to cancel but are unable to follow the steps described in the "how to cancel page", contact adobe support.
there are 2 ways to contact adobe; chat and twitter (now x):
chat:
use a browser that allows popups and cookies, and click 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.
twitter/x:
tweet @AdobeCare
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.
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