How can I get money back from fraud ??

Well, none of us here are Apple employees, we are users like you. If you feel you may have been defrauded, then you need to speak to Apple. However, before doing that, what makes you feel that you have been defrauded? We may be able to help you settle it without Apple getting involved.

Did you receive an email stating a purchase had been made? If so, it very well could have been a phishing attempt to get your account information. See this, Identify legitimate emails from the App Store or iTunes Store - Apple Support

If you saw this in your bank statement, then see this, If you see 'apple.com/bill' or an unfamiliar charge on your statement - Apple Support. This one would require you contact Apple.

did you send money to someone using Apple Cash? I don't believe you can get that money back.

Send and receive money with Apple Pay - Apple Support

see section How to cancel or dispute a payment

Fraudulent transaction on your Apple Card?

See your Apple Card spending history - Apple Support

section: How to report an issue

You can contact your credit card company to process a reverse the charges.