invalid login
got e-mail from apple.com saying my apple id used in new zealand. how do I fix it?
iPad 2 Wi-Fi + Cellular, iOS 11.2
Are you sure it was from Apple? Did it come from @apple.com? Apple will always address you by your name or the name they have on file for you. I would change my password and you may want to consider setting up 2 Factor Authentication or 2 Step Verification.
Apple ID email address or password - What to do after you change I suggest doing this before you change your Apple ID or password.
Apple ID -Two-factor authentication
Two Factor Authentification availability
Apple ID - Using app-specific passwords
Apple ID - Two Step Verification App Specific Passwords
Apple ID - Two Step Verifications FAQ