Caller: Says they are Telstra

Says they are Telstra calling about my internet connection.

When questioned, who are you calling" what is my name, what is my business name?

Answer "Sorry to trouble you sir" hangs up
or
"Ah, calling for Miss Dally, spelled Dally" My wife's name is actually Sally! and I definitely sound like a man...
or
blank stunned no reply..

Call back, number disconnected...

Yes they keep calling and seems like a scam to me.

Has called five times in one day. Hangs up when you pick up

Caller: 'Telstra'

has called repeatedly for about 5 days saying I have 'malicious content' on my computer and that I need to grant them remote control. calls outside of Telstra hours, has sworn several times when we say we will not give them card details and the such.

Caller: ?

hangs up