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@47550222 unfortunately, even if you never used it for a few years, you still downloaded to your device. So, no, you won't be getting any refund for the past years. You need to cancel it.  Because the payment was processed through as Apple, or Google, (depending on what device you used), those companies hold the billing relationship with you as a customer. Adobe, in this context, does not have the ability to access the accounts, billings, or even initiate or process a refund back to the user's credit card or account balance. 

Here’s how to cancel based on your subscription type:

On Android: Use our automated cancellation form to submit your request. It only takes a few moments.
On iOS (iPhone or iPad): To cancel your subscription, follow the instructions outlined in the help article.

For more info on How to cancel Acrobat Mobile:

To cancel a  Reader Mobile subscription, you must cancel through the app store where you subscribed—it will depend on the mobile device, Google Play for Android, Apple App Store for iPhones/iPads.

For example, on my Google Pixel 8:

Open the Google Play Store app on your Google Pixel 8. Tap your profile icon in the top-right corner of the screen. Tap "Payments & subscriptions" from the menu that appears. Tap "Subscriptions" to view a list of all your active subscriptions. Select the Adobe Acrobat subscription from the list. Tap "Cancel subscription". Follow the on-screen instructions and select a reason for cancellation to complete the process. 

On my Pixel, I even went to Acrobat Reader Mobile:

Tap the profile icon (top-right corner). Tap "Subscriptions". Tap "Manage subscriptions", which will open the Google Play Store subscription page. Follow the on-screen prompts in the Play Store to cancel the subscription. 

For more information to cancel:

https://community.adobe.com/t5/acrobat-reader-mobile-discussions/how-to-cancel-acrobat-mobile-or-scan-premium-subscriptions/td-p/15427692?linkId=100000396467912