Scammer. claims to be from NAB Security, calling to say your account has been compromised and details needs to be updated, I don't even have an NAB account!

says a unauthorized withdrawal from your account, he hung up when i said i would ring my bank straight away.

I get calls from (02) 6723 9857 at least twice every day. I never call back but it is so annoying.
Is there a way of blocking this number from my phone?

Very annoying

Scammer. Calling to verify and owner of a domain name that I never purchased

I confirm the same and I too have no NAB account

Five calls from this number today and all hang up when they hear a confident voice. try calling back and Telstra Message is number is not connected.

I called back number (02) 6723 9857 rang 2 times then goes to busy tone.