Man by name of Adam Fields rang me on a private number and said he was from Telstra. Said my internet had been hacked and my security was compromised. He gave me what was his Job ID : D750022 and I asked for a phone number to ring and confirm. He gave (03) 9043 6534 and when I rang that number it said not connected. I then rang Telstra who said he was NOT from Telstra and thanked me for the call.