Why was I charged money for using it?

This is a public forum, not the link to Adobe support
-other users here can't help with an account problem
Be sure to remain signed in with your Adobe ID before accessing the link below
-you must also allow 'cookies' in your web browser for this to work
https://helpx.adobe.com/contact/support.html
-click the chat icon at the bottom right of the page to open a chat session
-the chat icon looks like '3 dots inside a circle' at the lower right
-type AGENT into the chat window to connect directly to a person rather than the AI
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Also - beware of answering anyone who sends you a private message
https://community.adobe.com/t5/community-help/avoid-phishing-3-easy-ways-to-identify-adobe-staff/td-p/10791730

Sorry but there are NO Free Creative Cloud Plans. You may of started a Trial but once that ends, 7 days after you installed it, your CC will be billed.