When you subscribe inside the iPhone or Android app, the store bills you, not Spainward. Cancelling and refunds go through the store.
App Store
Open Settings on your iPhone, tap your name, then Subscriptions, and choose Spainward.
Google Play
Open the Google Play app, tap your profile picture, then Payments and subscriptions and Subscriptions, and choose Spainward.
Deleting the app doesn't cancel the subscription: cancel it in the store too.