Caller: Said they were from Telstra

I questioned that they were from Telstra and asked for my correspondence to be written via email they immediately hung up

Tried to tell me they were From Telstra regarding my internet very foreign voice, hung up and blocked

Caller: Caller from telstra

Caller claimed to be from Telstra tech dept claiming I’ve been hacked. I hung up on him!!

Unsolicited call from a mobile number with no message left but apparently from "Australia"

They rang and did not leave a message.

Obviously international caller, woman said she was from Telstra and it was about my Telstra internet connection .
I hung up & blocked the number.

Caller: Unknown

Got a call from this number saying they were from Telstra and claiming our internet line was being hacked. It sounded like a o/s call centre. When asked how we would we know they were from Telstra they said there is a unique identification number and got us to verify it thru a control with the windows key. Eventually taking us into the Event Viewer then Administrative Events to show the errors (hacks).
When asked to download a remote control program from the net I got extremely suspicious.
I said sorry but I am not comfortable With this I am going to call Telstra and verify, they got extremely agitated and said “why do you need to call Telstra when you are on the line to a person from Telstra?” They kept getting more angry that we were going to call Telstra.
I hung up, they rang again I ignored it and then went to ring the number back it came up with phone number disconnected!

I suggest hanging up, calling Telstra proper.

Caller: Foul Mouthed man with foreign accent pretending to be Telstra

I received a call on my work mobile from this number claiming to be Telstra calling about my Internet connection. When I informed him that there was nothing wrong with my internet connection he called me a F'ing A'Hole Bitch! - clearly a scammer picking the wrong target!