Possible hack ?

Not a hack. There is no known method of remotely hacking an iPhone. More likely just a scam message trying to get your details. Delete the message and ignore it.

If you did not purchase anything, and you have no record of any transaction anywhere, then it's very likely a scam.

See here: link-> Identify legitimate emails from the App Store or iTunes Store - Apple Support

and here: link-> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Unless your iPhone is jailbroken and/or someone had physical access to your phone (and knows your passcode, looks exactly like you, or knows your Apple ID credentials), it is not "hacked."

Most likely this was a scam. If you don't recognize the sender, you should never click on any links provided in the message. Just delete the message.

However, if you feel that your Apple ID has been compromised, I suggest that you follow the steps in this Apple Support article:

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

You may also find the following articles helpful, as well:

• Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
• Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support