apparently a call from Telstra letting me know people were hacking into my internet illegally, to get onto my computer press certain keys on my key so they could show me what they meant and they would also verify they were from Telstra. When I said I giving control of my computer to no-one, they hung up (not that I know if the key combination was going to do that!) When I try to call back it just hangs up. Very convincing and had an answer for everything, even when I asked 'how do I know this is not a crank call?'

I got a call saying they were a bank and mentioned that there was a suspicious transaction that was going to an american company for $800.
When i said i am not even registered with this bank and asked them why they are calling the person hung up

Caller: Scammer

Robo scam

Same as everyone else, hangs up when called back

they claimed new iphone bought on the credit card and started asking card details.

Hangs up about 7 seconds after answering. No speaking. Probably a scam.