Last Friday morning, I received an e-mail from Paypal and iTunes saying that I purchases an app for $19.99+tax and I immediately called Apple asking like what's going on. Unfortunately, they were no help and I also did a bit of researching on my own and found out that this has happened to several other people and found out that usually nothing can be done because there's technically a billing agreement or whatever. But stupid me didn't bother to contact Paypal to tell them to cancel that contract (because I was still waiting for Apple to resolve the issue.) This morning I received even MORE charges -__- This time they're charging me $29.96+tax for four apps that I didn't even purchase. They're all from the same seller Hangzhou MR.GLEE Tech. co., Ltd and I swear the purchases are the same exact items too. Nobody has access to my iTunes nor have I touched my iPod for weeks, so it's obviously not anything from my end. And just the fact that they're all from the same seller is pretty suspicious. I just hope I can get this resolved because I don't think it's likely that the case will be in my favor due to the billing contract thing :\
But bottom line is, if you have a credit card or Paypal account linked to your iTunes account, I would remove it and only add it back on when you have to update your apps or make purchases and afterward take it off again.