they claimed that my landline has been hacked and if i dont press 1 they will disconnect my phone line and cancel my isp i hung up

Missed call. Tried calling back with ID hidden, no valid number message. Google search suggests ATO. Possibly a scam.

Caller: unknown

I didn't answer but half a message was left - recorded voice said my internet is about to be disconnected and that I should press 1 to contact Telstra, press 2 to....(message ended)

Missed call from hampton so they left a message saying they were from national broadband network and because of a third party my landline and internet would be getting disconnect. To prevent this I had to press 1 to speak with one of their technicians. I assumed it was a scam so I looked up their number and I guess I was right.

Claimed my internet was about to be disconnected. Would not identify himself. I hung up. Definitely a scam

No message, Caller hung up when I answered. Caller identified as Hampton

hung up when I answered but I heard a click just before it did