This number called many times (12-15). They pretended to be OPTUS and asked for personal information. They are probably part of an identity theft ring.

Not so much a comment about this number, but telemarketers in general.
If they are not from this country and you don't want them to call back, don't simply hang up or put your number on the do not call register, be EXTREMELY racist. It works for me.
Personally, I don't care where someone is from or what they believe, but I use racism ALL THE TIME to upset these mongrels.
Only problem is, I enjoy doing it, but they don't call back, so I gotta wait for a new call centre to open up to do a new round.

I have been getting calls from this no. but told them that it's the wrong name & number, so we will see if I get them again. it's now the 5th day in a row.

who are these people? ive had 5 missed calls from them and they leave a voicemail but with nothing said and when i ring back its an automated message

Oh and that 02 number I was getting was (02) 8019 9700, I forgot to mention.

They call me in the afternoon... Probably know by now it would be hopeless to call me at ten am. Next time they call I am going to answer and screw with them.

Keep getting missed calls from this number.  Not goin to answer them and considering I'm on a do not call list they shouldn't be callin me anyways!

great way to turn the table well done

(02) 8198 3820 calls often, no one speaks when I pick up. Often it doesn't ring long enough to be answered in time.

I have been having the same problem with this (02) 8198 3820 it calls me every day at least once if not twice. I have never answered as I didn't recognise the number and they have never left a message, then I found this thread and it all made sense.Have called Optus but all they have done is say it's nothing to do with them and that they will register my complaint, I have also registed with the Do Not Call Register in the hope that this will stop them and lodged a complaint with the Ombusman.I doubt this will do any good but maybe if everyone does it, it may just annoy bloody Optus enough that they do something about it and at least taking our complaints seriously!