When I answered, there was an automated voice that just said "Goodbye"
When I tried to call it back, it just kept ringing

I called back the number (03) 9095 7621 but the phone just kept ringing

Caller: Unknown

Calls 2 three times a day during the week last couple of of months early morning sometimes around 6pm on other dayd,then doesn't leave a message It's annoying as hell.

3 x missed calls.
When I tried to return the call it just kept ringing, no answer.

Caller: (03) 9095 7623

I did not answer after viewing number, just checked it out on line, blocked now.

When you ring back it just keeps ringing.