Caller: Recorded message claiming to be Telstra - but appears to be a scam

I received a call this morning that upon answering immediately played a recorded message that said it was "Telstra calling to advise I had an urgent technical fault with my home internet service that meant it may shut down in next 24 hours - to speak with a technician to fix press '1' now." I suspect this is a scam, i.e. they called my work mobile phone which has no relationship with my home Telstra account - beware.