Calls but never leaves a message

Keep blocking these numbers from Blacktown nsw. Digits change slightly and keep callling back

Scam

Caller: Unsure

I return the call and it’s an Automated response stating ‘you’re being connected’.
This AAI rubbish can walk.
Whoever you are try leaving a number that is answered by a ‘REAL’ human being. Then you may just get the opportunity to speak to me. Until then, your automated system can eat a disc.

Caller: Supposedly commonwealth bank

Called answered said I wasn’t expecting them and they were unsure on how too reply then hung up called back and never said a word

Claimed to be from Commonwealth Bank. I told them I was not comfortable talking to them as I was not expecting a call from the Commonwealth Bank.