unknown charges on my card from 1-866-712-7753

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.

Numerous charges to my credit card, from apple.com/bill how can I see what these charges are for and who is charging my account?

On March 15, 2 charges, 2.71 and 17.81 totaling $20.52

On March 29 numerous charges such as 39.99, 19.99, 2.99, 9.99 and 34.98 totaling $107.94

There were 6 charges on March 30 totaling 264.93

Today April 5, there have been 4 charges 11.13, 19.99, 29.99, 37.98 equaling 99.09

Total of unknown charges $492.48

what are these charges for and who made them?