No message left. Also a mobile number called just before that. Suspect from same spammers?

Phone flagged number as suspected spam. Caller did not leave message.

They keep calling me even though I'm on the do not call register. They have been warned. 1st call Aussie accent young male, 2nd time Aussie accent young female. Not sure what is going on.

Didn't answer. No message left.

Mobile phone rang -picked it up -no response from caller for at least 10 seconds then some foreign female said "hello" heard some chatter (call centre?) in background - then I hung up.

Delay in answering and hung up after I said hello the 2nd time. Clearly o/seas call.

Caller: Adam from Green Solar

There was a delay so suspect the number is not legitimate. Told him I'm on Do Not Call Register and that a repeat call would see him reported. He hung up.

I answered but they hung up straight away. Did not call back

Delay in call time from person as though from overseas, "Hello my name is Adam how are you?"