Have been calling since Dec 2016 at between 5 and 7
As every one has said, scammers don't waste your time

these people call they my home phone they have my surname and tell me that as of next month my bill will change, so I ask them where they are calling from, with hesitation responds "the office" I asked which office responds "here in nsw" and hangs up

conclusion don't give them any money or personal details

Like other comments above, calls from that number received at same time multiple days per week with usual response of "goodbye" after answering. Also checked call-back, but can not connect. Problem is these calls go to my 90+ year-old mother who struggles to get to the phone to answer, but feels that she must in case it's family calling. This is a sick form of harassment. Telecommunications authorities in Aus should be able to facilitate blocking of this activity. Action required!

just block them

Spam. They call my work phone daily...

When answering I hear a foreign voice saying "Goodbye." Definitely spam.

gets me why telstra, when you pay for a silent number, feel its alright to onsell it to third parties anyway

They call daily maybe up to 4 times, finally picked up after weeks of this same number ringing only for the twits to tell me they are from Telstra when i rang the number back surprise surprise number is disconnected ... So really annoying

Canadian Pharmacy selling Viagra. Decided to answer after they rang me three times in 5 days......asked them not to call again. Guy insists they have a great deal at the moment

I foolishly answered - They are a Canadian Pharmacy Company selling Viagra etc....sounds like a call centre in India somewhere

When you return the Call , it states the number you called is not connected. O/S call channeling through unused local Australian numbers.

I called back number (02) 9119 9055 rang 4 times then goes to busy tone.

They call daily and do not leave a message. when you do pick up the phone a computer message states "goodbye." Really annoying!!