Caller: Woman speaking Mandarin

I've had a few mobile numbers call me with a recorded voice speaking Mandarin on the other end. Sometimes it's male, sometimes female. This time the call was from a landline in NSW. I didn't recognise the number so let it go to voicemail. When I listened to the message it was a woman speaking Mandarin. I don't speak Mandarin. Probably part of this Chinese scam that's been on the news. If you get a call from this number ignore it and delete the voice mail.