I got scammed too. I got an app for $14/week for some LG / Samsung screen sharing. We were in hotel and I wanted to stream something to TV in the hotel room so I quickly downloaded it. Wine did not help :( The app was charging me for one month. But then it disappeared from the store.
One problem is this weekly schedule: people do not check cc statements on weekly schedule. Also they should sent an iMessage a couple of days before the change.