Hello @Ritesh27758323x2e5,
I hope you are doing well. I am sorry for your experience with Adobe Scan.
Since Acrobat Premium is a mobile-based subscription, I suggest contacting the store where you purchased the subscription.
You may refer to the below links for more.
For Android
Our help article to learn more: Manage Subscriptions — Adobe Scan for Android
Initiate refund from the store: Request a refund on Google Play - Google Play Help
For iOS
Our help article to learn more: Manage Subscriptions — Adobe Scan for iOS
Initiate refund from the store: Request a refund for apps or content you bought from Apple - Apple Support.
Let me know if this helps.
Thanks,
Souvik.