canceled my free subscription and got charged

Subscription paid monthly doesn't mean monthly contract .I think you had an annual subscription paid monthly and in this case an early termination applies a fees .

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... https://www.adobe.com/misc/subscription_terms.html

Unless you had a true MONTHLY subscription Re: Being charged for a full year when i'm on month-to-month payments? what you had was an ANNUAL subscription with monthly payments

Just like a car lease, you signed up for a year... and you pay a fee to cancel early

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