Caller: Not Commonwealth

They called up and I had missed it, they then left a message with a similar but wrong last name and saying its a rep from commonwealth and that its urgent and required immediate call back.
I called back and they couldn't identify them selves and couldn't explain reason why for the call. They also tried getting me to provide my full details repeatedly and started getting frustrated when I asked how do I know this is commonwealth. I then proceeded to say check your system under this anna rep, she called so she should know. They then abruptly said you can call back later and ended the call.

I followed with a call to the official Commonwealth number and surprise surprise there is no record of them calling me or any reason for them to call. They also said they would never call and ask for your details and only the other way around.

I called back the number (02) 9120 1501 and the lady on the other line said the company name is Commonwealth Bank