Suspicious call from a Call Centre judging by the noise in the background

Caller: Don’t know

Some female caller with Indian accent with a background noise of a call centre. Asking me how I was and saying something about her company. I informed her that my number is on the do not call list and I want her company name to report them. She paused and looked for where to read her spiel and decided to hang up.

Received a call from this number advising they were from Commonwealth Bank fraudulent transactions department and there had been someone in the US attempting to withdraw money from my account. The number called is a work phone with no links to any accounts and I do not have an account with Commonwealth. SCAM!

Said she was from Telstra tech and problem with downloads on my devices. Told her I'd fix it myself. She didn't like that and hung up.

Scam!!!!
Some male caller with Indian accent telling me they are from the security department of VISA and Mastercard (come on...) and they identified a transaction made this morning on my VISA card... I told him I don't have any VISA card and then he repeated/read the same statement and asked aggressively "do you understand?"
Get a real job man

Caller: supposedly from Telstra tech support

said I had internet problem with devices e.g computer, tablet etc and wanted me to go online then. Told her I would call Telstra myself. She hung up.

number not connected when I call back - Indian.....
Scumbag