Pretended to be from Telstra and advised me that our computer was malfunctioning. He wanted me to sit in front of my computer to fix the problem myself...

Just received a call from this number telling me my ip address has been used all over the world and she is from Telstra. Then asked me if I am in front of my computer.
I then hung up the phone

They said they were from Telstra i and called the number and was told it was disconnected

keeps calling but does not leave a message must be a scam.