I have a Twitch sub even though I haven't paid anything?

I once subscribed to a streamer for a fee and a month later I got the message that my subscription had expired, but now I got the sub for another month even though I didn't pay anything and the sub was not given to me either

Have you bought a tier 1 sub? This is subscribed to again and again after a month, i.e. Paid for again. This happens automatically. But you can go to twitch where the subscribers are listed and cancel it