Persistent Prank Caller, rings once a day, every day since about Xmas time 20127 through start of Jan 2018 (currently). Never answer unidentifiable callers!

Female caller; Wanted to speak to the person in charge of the phone account, yet when advised to contact our central office she abruptly hung up.

Wanted to speak to the person in charge of telephone account. Said they had a representative in the area and wanted to make an appointment to call in to discuss our telephone needs. Just told them not interested.

When you call back you get a message saying:
"Optus advises that the number you are calling is disconnected"

If Optus's network security is so bad that someone can make a call using one of their numbers then that sounds like a very good reason to not use them.

Idiot

receiving calls from this number several times a week.

These guys are persistent. 20 calls over past week and won't leave message so I don't return their call. Still playing cat and mouse

the number you are calling is not connected, voice message?
WTF

I called back number (08) 6267 0200 rang 3 times then goes to busy tone.