Apple support: the real phone number

Yes. It is the Apple support number listed on Apple's own US contact page. But a caller showing this number on your screen may still be a scammer, because caller ID can be faked. Hang up and call it yourself.

Only when you've asked Apple to call you, for example through the Apple Support app. Apple's advice: "If you get an unsolicited or suspicious phone call from someone claiming to be from Apple or Apple Support, just hang up." Then contact Apple yourself.

Don't call any number in it or click its links. Check your purchase history yourself, in your Apple Account settings on your device. If the purchase isn't there, the email was the scam. Forward it to reportphishing@apple.com.

Don't give it. Apple tells you to "never share your Apple Account password or verification codes with anyone. Apple never asks for this information to provide support." Hang up or stop replying.

If they had remote access, disconnect from the internet. From a different device, change your Apple Account password and call your bank. Then go to What to do now.