while you're signing up for that trial, there is (not in fine print) info about the terms to which you're agreeing, which limits your trial to 7 days and requires timely cancellation to avoid a penalty. and there is also some fine print.
at this point, you can appeal to adobe support for sympathy, but stating things like i wasn't told is not going to generate sympathy. it's better to state, i didn't notice any warning about a penalty etc.
anyway, there are 3 ways to contact adobe; chat, phone and twitter:
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.
phone:
https://helpx.adobe.com/contact/phone.html
twitter:
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. 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
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