Suspected scammers, have received multiple calls from various mobile phone numbers talking about people paying too much tax. Attempting to dial these number back results in a message from Optus advising that the number is disconnected. I am also on the do not call register

I called back number 0434 362 498 rang once then goes to busy tone.

Annoying calls keep coming from this number with the caller saying they are from Lifestyle Direct. I receive one call every day and they will not leave me alone even when I tell them to remove me from their call list. If you call the number back it comes up with the Optus message saying the phone is disconnected.