I'm being charged but I don't have any plans/subscriptions

I got my refund. You can see how I did it at the Google Maps review I wrote:

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If you do not have any active plans, and the ‘unknown’ link that was provided does not result in finding something you missed, you need to contact the fraud department at your credit card to report your information being stolen

use https://helpx.adobe.com/manage-account/kb/unknown-charge-on-bill.html to find the charged account.  then use https://account.adobe.com to find that account.

and if you still want to cancel your subscription(s), make sure you're aware of the cancellation terms by selecting your plan type (at the top of the page here), https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html 

for info on how to cancel your subscription, this page describes the few steps involved, https://helpx.adobe.com/manage-account/using/cancel-subscription.html

if you want to cancel but are unable to follow the steps described in the "how to cancel page", you probably have a payment error that you need to repair before cancellation is allowed, https://helpx.adobe.com/manage-account/kb/fix-failed-missed-payment.html