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At a minimum, change your password. You also might want to consider a name change so they won't know your Apple ID. If you provided answers to your security questions, consider changing them also. If you supplied a credit card number, cancel the card with your bank.

Apple ID Name Change

Apple ID Password Change

What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.

Apple ID security questions

Apple will always address you by your name or the name they have on file for you and the e-mail will be from @apple.com or @iTunes.com. E-mail addresses can be spoofed. You can go to Mail/View/Message/Show all Headers to see more.

Send the e-mail to Apple as an attachment to a new e-mail before deleting it. You can forward as an attachment by going to Mail/Message/Forward as attachment.

reportphishing@apple.com

It is fake.

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

With the minimal amount of information you provided, my guess is that it is a phishing scam.