Your free trial will automatically convert to a paid plan on Day 8 at which point you may cancel and request a refund. You have 14 days to cancel without penalty. See link below for details.
https://helpx.adobe.com/manage-account/using/cancel-subscription.html
1. With a browser that accepts cookies and does not have script blockers, please log-in to your account portal below.
https://account.adobe.com/plans
2. Scroll down to Contact Adobe on the same page.
3. Online chat is available in English 24/7.
4. In the chat box, type AGENT followed by enter key and wait for a human.
5. Alternately, phone customer service M-F during normal business hours.
https://www.adobe.com/about-adobe/contact.html