Cancellation of Adobe Acrobat Reader subscription after one Year

2 things:

a) there is no subscription for Acrobat Reader. You have either Acrobat Standard or Pro.

b) the cancellation fee is half of your remaining due. It is taken because you promised to pay a subscription for a year, but terminating early. During the last month of your yearly subscription, it is possible to cancel without a fee. The subscription renews automatically for another year after that, so the cancellation fee will be again half of the remaining due, which is about 11 months/2.

Now to get you out of your impasse, the only way is to contact Adobe Customer care, so yes there is a way to do so.

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! If the chat window fails to open, or is non-responsive, use a different device to start the interaction. Type "agent", if you want to bypass the initial chatbot.
Support phone numbers may be found here: https://helpx.adobe.com/contact/phone.html. Please note that phone charges may apply.

(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)

Please let us know if you need more support.