Hello AlvesN,
It appears you are having an issue with an app remaining on your iPhone even after attempting to remove it. The article you came from, How to cancel a subscription from Apple, has great information on how to cancel any subscription associated with the app.
Let's check and see if the app is still on the device.
Swipe left until you arrive at the App Library. Tap in the top search area. This should present a screen that has all the apps in alphabetical order. Scroll down and check if the app is there. If it is, touch and hold the app icon, then tap Delete App. More information on the App Library can be found here: Organize the Home Screen and App Library on your iPhone - Apple Support
If you do not see the app in the App Library, we would recommend reaching out to the app developer for further assistance: How to contact an app developer - Apple Support
Have a good day.