Don't answer this number

missed call, rang back straight away, Optus advised it's disconnected. very suspicious.

Same thing for me, this number is disconnected? How does this work?

spam or nuisance call. When callback, the # is not connected.

Called back to here the message ' the number you have called is not connected'.

This unrecognised # called but left no message. I found no mention of it on any reverse # sites, so called it back- to discover the # is not connected!?

electricity company