Twitch Prime subscription not ending?

I haven't been able to use my Prime Sub for 3 months.

I once subscribed to someone via Twitch Prime, and the subscription should automatically expire after 1 month. But that doesn't happen to me. Twitch Prime automatically subscribes to the same streamer every month. How can I fix this?

You can end this in the Google Play settings under Subscriptions. I think that should also go in the twitch settings.