billing

How can i stop itunes from taking money out of my account for apps im not buying. Im talking like $15.22, $4.86, AND 1.29. Also someone broke into my account which was for exchanging money, and moo moo. These apps are dangerous. who can i contact for help. I tried calling a number which is 1-866-712-7753, all it says is to check my subscriptions and hangs up. I have one subscription n it is yearly