Caller: Claiming to be Telstra

Telstra alerting me that my computer ip and security is under threat. "Serious call to help protect your computer security". wanted details of computer etc, after 3 minutes of me being sceptical I offered to call her back when I had a moment - she abruptly hung up. I called the number "This number is not connected". Lying scammers, basically don't trust anyone over the phone.