Claimed to be ATO. Voice was overly squeaky and second number to try call today leaving no voicemail. Answered on second ring

It was robocall claiming to have called from ATO. I didn't listen to the whole message as I have received these calls before and they are part of a scam claiming that you have tax debt that needs to be paid or will be investigated etc.

Caller: Scam

ATO unpaid tax scam

Called them back and they answered as the ATO. Likely scam.