I am in Brisbane, caller claimed to be from NBN. When I said I did not want to discuss it, Asian caller became aggressive at which point I hung up.

Scam!

Hung up as soon as I answered. Called back and the line cut out.

Caller: Amazon Customer service?

Said my Amazon service will automatically be charged the annual renewal fee. Scammers will be reported to Scamwatch .com.au without fail.
Block their calls & report them.

I asked who it was and they hung up

SCAM, he said he is from NBN telstra, but im not connected to telstra, asking how fast my internet

Called my mobile and they didn’t leave me a voicemail message on it

Unknown caller - no message left