I had exactly same situation as the previous person.

Missed the call whilst at work and when I tried to call back the number was not in service...how do I stop this from happening? I have two numbers that are ringing me everyday...the other number is 0488 828 402...this is the first time 0488 828 441 called but its the same thing

picked up n answer made a noise then disconnected... well played sir...

Didn't answer their call. Called back and got a message saying the number you are calling is no longer in service. Blocked the number.

Answered, silence, hang up. called back. "Number not in service" Scam, blokced

Didn't answer. I called back and there was a message saying this number is not in service. Sounds like a scam.