Caller: Unknown

Called me once around midday for a few days now, never leaves a message. I don't know anyone at all in that area code and have no business with anyone there. Probably a rerouted scam call checking if phone numbers are valid

Calls several times a week; if I answer there is a second or so of silence then it hangs up.
Blocked due to annoyance!

I called back number (03) 9695 8804 reached voice mail but did not say for what company.