Hello @Christina34898881nmsd,
I hope you are doing well. I am sorry for your experience with Acrobat Reader Mobile.
Since Acrobat Premium is a mobile-based subscription, I suggest you contact your store from 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.