Caller: ???

Automated, beep and said goodbye

so I had a call from the above number, when I called back it was disconnected (I hid my caller ID). 30 mins later I received a call from a similar number (03) 9478 9564, they referred to me by my last name and wanted to sell me something. When I asked what their location was and how they got my number they terminated the call.

They called I answered and it hung up. When I called back, with my number hidden of course it said that it was disconnected.

beep and good bye

Same as above

Some sort of number check ?

solar salesperson

must be a call centre - all that was heard, was goodbye. what a waste of energy