How can I request the refund for a cancelled subscription?

make sure you're aware of the cancellation terms by selecting your plan type (at the top of the page here), https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html

for info on how to cancel your subscription, this page describes the few steps involved, https://helpx.adobe.com/manage-account/using/cancel-subscription.html

if you want to cancel but are unable to follow the steps described in the "how to cancel page", contact adobe support.

there are 2 ways to contact adobe; chat and twitter (now x):

chat:
use a browser that allows popups and cookies, and click here, https://helpx.adobe.com/contact.html?rghtup=autoOpen
in the chat field (lower right), type AGENT
be patient, it can take quite a while to reach a human.

twitter/x:
tweet @AdobeCare

p.s. if you're contacted by anyone (via email or private message), it's much more likely to be a scammer than an adobe representative.

Hi @Dameli336370659c2v, I'm sorry to hear about the trouble subscribing. We don't have any user account information here in the support Community. You will need to get on with Adobe support via chat to sort it out. Do it as soon as possible:

For chat support, make sure you are signed in with your Adobe ID.

— Look up your current plans here: https://account.adobe.com.

— Type AGENT in the chat box to bypass the automatic chatbot and be connected to a live person.

— Chat Link: https://helpx.adobe.com/contact.html?rghtup=autoOpen