Accidentally Licensed a Font

Standard licences are one credit point. Templates and similar items seam also to be one credit points. If you have the 10 credits per month licence, all you can license shows the license button. Other buttons show the price, either in credits, if you have the "right" credits (credit packs) or in your currency. 

There is no way to undo this, but you can contact support for a credit return. 

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.
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)