I called back the number (02) 9137 2709 and reached vm that did not mention the company name

It shuts straight away when I answer. I called back the number (02) 9137 2709 and reached voice mail that did not mention the company name.
Searched it on true caller it said tax but the taxation office would have a proper answering system.
It’s a hoax call just blocked it.

I called back the number (02) 9137 2709 and received a voicemail saying all of the operators were busy, but did not mention that company name.

It called when to answer and it hung up, called back went to a VM and said was busy and will call back later. No company mentioned. Annoying.

I rang back and got voicemail saying “hi all of our operators are busy and we will ring you back shortly”. No company name, no nothing.