they have just called me too, saying that they were from Telstra and that my PC was going to crash if I hadn't fixed it through their support team. It was a very suspicious call but seeing that I had really experienced issues lately with my PC I have trusted them. so this guy, called Michael Williams (ID Td6162) with strong Indian accent started to drive me through few steps on my computer. then he asked me to download a program which I did and I have noticed that he was actually getting in my computer so I have closed everything down saying that I didn't want to go ahead. I have asked for his number, he gave me the 0280057245 which I have called back and a voicemail machine answered. he then called me back saying that the lines are very busy and he insisted on keep going in fixing my computer. at that point I have told him not to call back that I would have called the police and he hung up. DO NOT TRUST these people, I have called Telstra and they said they didn't call me, it is a scam, be aware!!!