I can imagine a scenario where you need to login to cancel your subscription, but can't login because your banned. A while back Tinder was trying to bypass the Google Play subscription system so this is very possible.
And file a chargeback request with the credit card company - service paid for but not received. The "customer is always right" in this scenario (speaking as someone who has an Internet based business that accepts credit card payments). As long as you don't make a habit of doing it, you'll get your money back.
They did if he signed up from Tinder.com. Not cancelling is if he subscribed via Play/App Store which presumably they have no control of on their side?
