Indian sounding woman. Said she was from Telstra Technical Department. Ringing about my internet. She says "It is slow, right?".

Firstly I am not with Telstra.
Secondly my internet is fine, thankyou.
Not that I told her that.....I just hung up.

Interesting thing is, the phone number appears to be in my local area.
I am presuming they can mask it now.

Indian voice said to be from Security Department of Telstra. I terminated call as unlikely.