Received a call from 'them' last night. Left some garbled incomprehensible message on my voicemail. They tried again but from a different number (02) 8956 7000.

tell them to stop call and when I answer they are not there.

If I want to buy something I will call you!  Stop calling me!!

Just got a call from this number. I asked how they could verify that they were from optus, and they said it would breach confidentiality, and that I should check with Optus Customer Service. I hung up at that point, and did just so, Optus was unable to find the number on their database, they had no record of my being called by an optus service (should be recorded every time optus calls someone), and felt strongly that this is indeed a marketing group.

Received 3 calls from this number, 1 on each of the last 3 days and have not answered any of them. Suspect it to be Optus telemarketing. I'll continue to let them ring out...

They tried to call me 30min ago, didn't hear so didn't answer. No message left. If they call I'll answer then interrogate them, maybe ask for their ABN etc

i dialed the number also, and it too was busy

I just answered a call from this number (02) 8956 0300....offering me free $30 credit because my sim is about to 'expire'....all they wanted was my date of birth - I didn't give it to them of course, so I got nothing but rudeness and an abrupt reminder to recharge my account. I believe it is a scam...anyway I REFUSE to ever give out info over the phone..even for $30 free credit.