I called back number (03) 9203 2984 reached voice mail of company called telstra.

It is Telstra, you are a customer, so why is it so hard for them to leave a simple message like anyone else does when your phone goes to voicemail. No, not Telstra reps, just keep ringing and ringing and ringing such that ultimately you piss off your customer !!!!

It is Telstra. Legit

It's Telstra business - checking that you're happy with your mobile plan. I'd tell them if I wasn't. They sent me and sms which confirmed they were from Telstra as I had received promotional texts from them in the past.

This number is for Telstra Business Mobile services, quite legitimate.

YES ....I received this call 2 times + I DID NOT pick up the phone.... Have number check facility on my phone ....... if you see its this no .... do not answer ok.

Person purporting to be Telstra, asking for personal info to ID, they then skim your identity / credit card.