Reembolso Adobe Firefly Standard

@Crybebu you should receive an email confirming that your subscription has been cancelled. This email will usually state the date of cancellation, the subscription plan that was cancelled, and when your access to the paid features will end. Or you might be given a confirmation number or transaction ID right on the screen. It's a good idea to screenshot this page if you see it, in addition to looking for the email. Double check your email (including spam/junk folders) and your Adobe account history for this confirmation. 

If you go to your adobe.com account, under "Plans" or "Manage Plan") should update to reflect the cancellation status. It might show the plan as "Cancelled" or indicate the end date of your service. This can also serve as proof as well. 

With regards to refunds, do check this page for refunds, you may not be entitled to any at all:
https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html