Scary eh Drron, they are using Aust mobile phones now.
If its not like the ones you describe,
a.then its the NAB sending "your account has been locked" also from an Aust mobile phone number.
b.turns out scammers can now get into peoples Amazon account somehow, from a geo location of Sydney no less.
Even Aust is not immune now from scammers with Aust mobile phone numbers, real or spoof.
For VPS, trace the raw message sender, and block the Lady, or hover over sender, but then again, too, maybe that is a pointless exercise, as they will just use ((cvbbeerrttqy2*m*il@m*ai.com)) to send their next spam spam.