My family fell for this late last year. They did give a sydney number. Were of Indian accent, got access i believe by dropping spyware into computer as knew personal information and computer stats/settings etc. Wife took 1st call and was convinced, did the log in. I came home to see mouse remotely activated, asked what was going on and pulled connection. Two days on they call again, i answer,...the person wants me to reconnect...the pitch is pro and polished(microsoft etc,, Sydney number which i call to confirm etc. I blast and hang up. That night, computer hangs at start up and after sfforts to salvage i have had to buy new computer, change link info and serial numbers and personal info.... This scam is very, very real. The cost of computer is small compared to the rest of the hassles.
If your computer is used by family group etc tell them...don't assume everyone knows...don't tell personal info to strangers....and keep your anti spam / virus up to date...steven
for site users: my system is safe but do rember to update your security its for all our safeguard.