Hi. I started free trial on December and did not know it was monthly payment. I paid January, Feburary and March and finally found out that I've paid it for three months. I did not used stock at all. Can I get a refund of those three months payments? Thank you.
For information on how to cancel your Stock subscription, please check the following page:
/!\ Before you cancel your membership, carefully read the Adobe subscription terms. When cancelling, you’ll be charged a lump sum amount of 50% of your remaining contract obligation and your service will continue until the end of that month’s billing period.
can't speak for Adobe's policy in this matter, but I strongly recommend to contact the Adobe customer support for this and to negotiate your way out of the contract. Adobe customer care can be contacted here: https://helpx.adobe.com/contact.html - click the small callout at the lower right of the screen and type "agent".
(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703)