Why did you charge me $4.99 ?

Unknown Charge

• Curious about a Charge? --> If you see an 'itunes.com/bill' or an unfamiliar charge on your statement
• If you have an issue with an app on App Store or billing --> Request a refund for an App Store or iTunes Store
• You can also request a refund for a recent renewal of an in-app subscription.purchase 

Phishing

• Beware of --> Phishing & Other Suspicious Emails 
• Know how to --> Identify legitimate emails from the App Store or iTunes Store 
• Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams —> Use these tips to avoid scams and learn what to do if you think your Apple ID has been compromised.

This is a user

helping other users with tech questions forum, you are not addressing apple

here  just  fellow users

try

Request a refund for apps or content that you bought from Apple - Apple Support

Apple Support Community Forum

This is Apple Support Community forum, for a user to user interaction for information & idea sharing between users, if need be, extend support on technical knowhow in handling Apple products from a more experienced fellow user, This is not the right forum to discuss with Apple Inc.

For these questions, you may Contact Apple Inc or your Apple Online Store, Apple Retail Stores directly or contact support

If I were you I’d be wanting to check that email is genuine. Looks a bit fake to me. Has there actually been a debit from your account? Whatever you do don’t log into your account from any link in the email.