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Caller Type: Scam

In addition to my last comment, another site says the phone carrier associated with this mobile number claiming to be Telstra is Vodafone, not Telstra. So, more than likely a scam.

Caller Type: Unknown

I let the call go to voicemail. Message claimed to be from Telstra, saying my mobile service would stop soon. Press 1 for English and 2 for Chinese. Then message was repeated in Chinese (I assume). As the number doesn't appear in search engines as related in any way to Telstra, I'm guessing it's spam/scam.