I would like to thank you for providing the information that was requested. I understand the app "Dark Knight" was listed as free but your account was charged for it. I certainly appreciate you taking the time to get back to me, and I will gladly assist you further.
I have reviewed this application on the iTunes Store, but was unable to locate a free version for it. However there are similar games available on the same page which are for free. Since you did not intend to purchase this app, I have reversed the charge of it. In three to five business days, a credit of $2.99 should be posted to the credit card that appears on the receipt for that purchase.
I'm happy to tell you about a feature the iTunes Store that provides a warning message to ask if you are sure that you want to buy an item. This warning can be turned off. If you would like to make sure that this warning is on, you can reset the warnings in the iTunes Store by following the instructions in this article: