You can check your Apple purchases to see if you can find one for that amount: See your purchase history in the App Store or iTunes Store - Apple Support
If you don't see a purchase for that amount on or around the date the charge was processed on your card, then it is not a legitimate charge and you should contact your Bank or Credit Card company's Fraud Department.
Otherwise, you should see the charge in your purchase history. If you wish to dispute the charge on your iTunes/App Store account, you can either:
or contact
Best of luck,
GB