missed call, called back, number not connected

calls back to that number are not acceptable. what the hell is that? another sham?

Answered phone and they hung up immediately - returned call and number disconnected. POssible identity theft call as per a current Affair on 11 May 2018

exactly as above missed the call then called back phone number was disconnected have also had missed calls from (03) 8253 0801 but didn’t bother calling back