What subscription do you have? $21 could be the 1Tb Photography plan. Did you take a trial and did not cancel after the 7 day trial ended? If you got charged since March, that makes a lot of time to check your accounts. I would recommend to adopt a more dynamic account checking.
The $30 ($31.50?) is the early termination fee, which is half of the remaining dues. That would mean, at your rate, that you have a subscription that is still good for 3 months.
If you think this is by error, contact Adobe customer care. Adobe customer care can be contacted by beginning a secure chat session at https://helpx.adobe.com/contact.html?rghtup=autoOpen. Pop-up blockers need to be disabled, you need to accept cookies! If the chat window fails to open, or is non-responsive, use a different device and/or browser to start the interaction.
For support via Twitter:
https://twitter.com/AdobeCare
(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here
https://community.adobe.com/t5/account-payment-plan/how-to-contact-adobe-support/td-p/11843852)
Important: Adobe does NOT contact you unsolicited by e-mail or direct message. If you get contacted by direct message from a person, claiming to be an Adobe employee, look at that profile and check if they bear the “Adobe Employee” marking under their name. Adobe support does not use Skype to give you support.
If in doubt, ask the forum.