Caller: unknown caller

Number came up on my phone as having come from New Zealand and a robotic voice started to advise me they were from border control and there was a parcel from "Australian" Post containing prohibited items. I hung up on them then as for at least a month I get one, sometimes more, messages every day from "Australian Post in my email inbox. What these idiots don't seem to know is that our postal system does not hold parcels indefinitely and is not known as Australian Post.