When answered, automated voice starts saying it is the ATO & they are contacting as legal action is being taken against you......hung up and have blocked number

Left message saying they are taking legal action. Asking to call this number.

Caller: I don't know

Also had this same call - definitely spam

robot voice saying there is a lawsuit against me and if I dont call back ill be arrested (in poorly written english). SCAM

Oh yes, its a ATO scam.

Caller: Scammer claiming to be from ATO, call went straight into voicemail

Threaten with warrant of arrest, asked to call back.

Computerised message saying a lawsuit has been filed under my name.