I called back number (07) 4799 2060 reached voice mail for Telstra.

Yes, I had a call from Telstra in response to an email that I had sent to them.
Very nice Australian lady with a helpful answer. This is really rare these days!

This is actually Telstra Faults, it is legitimate.

this is a direct line to the telstra faults department

Wrong you f*ck its telstra

Really really nice, calling about setting up nbn.

please unblock this number

Not Spam. Telstra Faults

This is the Telstra mob, the one in Australia. Legit.

It IS Telstra. I have had two calls from this number in response to a call back request. It is legitimate.

Scam

It is Telstra (Australia). I think it's Telstra Platinum, in Townsville.
It comes up as 'Suspected Spam' on my mobile phone.

Scam this is not telstra

Telemarketer.