When this many ppl report it, it is the usual cockroaches from the usual overseas source. Note for govt seat warmers and trough sucking career politicians>
SHUT DOWN THE TAXPAYER ROBBERY "DO NOT CALL REGISTER" SCAM, AND USE THE TECH WE PAY FOR, TO STOP ILLEGAL SPOOFING AND THEFT OF LOCAL NUMBERS, AND ALL TELEPHONE BASED SCAMMING

Possibly a nuisance caller. Have rung me 4 times in the past week - they hang up as soon as I answer.

Possible Telstra scam, said he was from the technical department and that we had some online errors.