How to cancel unauthorized apps from charging my account
Hill Climb Racing is illegally charging my account, how do I stop it and credit my account?
iPhone 4S, iOS 6.0.1
I have never seem reports of this. It is a free app so I'm sure you failed to properly understand In-Apps.
iTunes Store: About In-App Purchases
http://support.apple.com/kb/HT4009
iOS: Understanding Restrictions