I forgot to delete my plan on Stock after the trial ended.
Now I don't want to use it anymore but can I delete the plan without paying the new month? Even if the trial ended this morning?
If you cancel during the first 14 days of your paid subscription, you will get refunded.
Look here for instructions on how to cancel:
If have problems to self cancel, 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! 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