No he podido solucionar mi cancelación de prueba de stock

I see that customer care worked with you to cancel your Adobe Stock subscription. I appreciate you letting us know about the confusing messaging in the online cancellation process and I have sent your feedback to the responsible team to review.

To cancel your stock subscription: Cancel your Adobe Stock membership .

If you need further help on this, please 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
https://community.adobe.com/t5/account-payment-plan/how-to-contact-adobe-support/td-p/11843852)