When I answered nobody spoke. I waited, said hello again, nobody spoke. Will block this number.

I answered with my name, could hear someone typing in the background then said hello twice then after no answer I hung up. However like the previous comment here, I too was waiting a call back from Breville!

Caller: Nobody called. No voice

Called and I said hello, waited for about two minutes they didn't hang up so I did.
I was actually expecting a call back from Breville so I'm not sure if this is related.

When I answered nobody spoke. I waited, said hello again, nobody spoke. Will block this number.

I called back number (02) 8304 5576 rang once then goes to busy tone.