Cancellation

You gave Adobe your credit card number so they could bill you.  Why else would they ask for it?

When you 'click to agree' to the subscription terms while buying a subscription, that means that you really do need to read BEFORE you buy a subscription... See this page for more information, including a highlited section from the subscription page https://community.adobe.com/t5/account-payment-plan/cancellation/m-p/12153645

I've moved this from the Using the Community forum (which is the forum for issues using the forums) to the Account, Payment, & Plan forum.

You need to cancel the trial. See here:

https://helpx.adobe.com/manage-account/using/cancel-subscription.html