This is a scam call. I didn't pick up, immediately afterwards a voicemail under "private" was left, so I can only assume it's from this number when it was ringing out. In Mandarin, it said my Telstra phone account has been cancelled and proceeded to say press 1 for Chinese, press 2 for English. I can definitely see elderly Chinese Australians falling for this kind of rubbish (keep in mind scammers are blind to what kind of people they can scam and will take on any advantage, so go easy on the assumption of prejudice being protective or easy to spot, arseholes are just arseholes, every place and culture in the world have them).