how do i cancel a fraud purchase on my apple id?

Contact iTunes Support for assistance. See the Apple Support articles below for contact information.   

iTunes Support – world wide   -

Apple Support schedule phone call     -

Billings and Subscriptions   -

Apple on Twitter

See the following Apple articles:

View your purchase history for the App Store, iTunes Store, and other Apple media services

View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support

How apps, content, and subscriptions from Apple are billed

How apps, content, and subscriptions from Apple are billed - Apple Support

If you want to cancel a subscription from Apple

If you want to cancel a subscription from Apple - Apple Support

If the subscription that you want to cancel is not listed

If you want to cancel a subscription from Apple - Apple Support

If you see "apple.com/bill" on your billing statement

If you see "apple.com/bill" on your billing statement – Apple Support (UK)

Identify legitimate emails from the App Store or iTunes Store

Identify legitimate emails from the App Store or iTunes Store - Apple Support

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

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

• You can try to request a refund, refund only within 90 days.
• If you have requested a refund, you must wait until Apple has approved. Then you will receive a message from Apple.
• If your refund is approved, the funds will be applied to the same payment method that you used to buy the item.

See also the following Apple articles:

If you think your Apple ID has been compromised

If you think your Apple ID has been compromised - Apple Support

Recognize and avoid phishing messages, phony support calls, and other scams

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

• If you receive a suspicious email or SMS text message that looks like it's supposed to be from Apple, please email it to reportphishing@apple.com

• To report illegal, obnoxious, unwanted or malicious e-mail from an Outlook.com, Hotmail, Live or MSN account, please forward the unwanted message in its entirety (including the entire message header), to abuse@outlook.com

• To report illegal, obnoxious, unwanted or malicious e-mail from Gmail -> https://support.google.com/a/answer/178266?hl=en

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support

Detect and block spam phone calls

Detect and block spam phone calls - Apple Support

 Don't jailbroken your iPhone.