Denial of purchase being charged for

What does the email say ? Is it a genuine emailed receipt or a phishing email ?

Phishing and similar emails : Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

Genuine iTunes emails : Identifying legitimate emails from the iTunes Store - Apple Support

Viewing an account's purchase history : See your purchase history in the iTunes Store - Apple Support 

Looks genuine, and you've looked at the account's purchase history ? But it's not a good idea to post images that contain your email address and billing address on a public forum.

If you claim you didn't buy it (I assume you've changed the account's password etc.) contact iTunes Support and see what they say : http://reportaproblem.apple.com or http://www.apple.com/support/itunes/ww (click on your country's flag, the country where you live, and which is therefore the country on the account ; click on Contact Support towards the top right ; click on Get Help under 'Talk To Us’)