I signed up a few months ago for a free trial, since then I haven’t used Adobe but it took our 9.98 from my bank every month and I didn’t know how to cancel my subscription since it wasn’t on the App Store, how do I get a refund?

You mention app store… did you buy from Apple or Google Play?

See here:

https://helpx.adobe.com/manage-account/using/creative-cloud-subscription-terms.html

and here:

https://helpx.adobe.com/manage-account/using/cancel-subscription.html

You need to have a valid form of payment before you can cancel a subscription and get a refund.

https://helpx.adobe.com/account/individual/billing-and-payments/payment-methods/update-payment-information.html