Cancellation of subscription on a non I phone

This article lists all the ways you can manage a subscription:

See or cancel your subscriptions - Apple Support

If you still can't stop it:

Contact Apple for support and service - Apple Support

Good luck!

You can cancel subscriptions on a PC - please see https://support.apple.com/HT202039#otherdevices

or on a Mac - https://support.apple.com/HT202039#macos

If you don't have access to a PC or a Mac you will need to contact Support.