Said was from Telstra Techincal department and said my internet was hacked. Asking for internet details so that they can hack me !!
Told them to bugger off. When I called their number, it said that it could not be connected.

2nd call today from 'Telstra' about fixing my computer. Previous call was from (02) 4478 9654. As soon as I said I was on another call would they please hold, they hung up.

Claiming to be Telstra, asking to get access to computer.

missed call from this number; called back but number disconnected (recorded msg)
probably a scam number