I had this one today... and for the last few days i have had (03) 8808 1400 as well. first couple of times they let it go to voicemail but left no message, I hate when arseholes do that and it costs me money to get no message!

Glad I know its Telstra now, I will continue not to answer it lol

when they do answer they are pushing a phone upgrade and a plan upgrade also.

it's not telstra directly but an outside company with all your details. my plan expires in a fortnight and they knew all my codes and usage of my number.

I'm disconnecting this number right now due to barrage of calls i have received in the 8 calls from 5 different numbers in the 0388 range. it's getting out of hand and i am trying to work.

It's Telstra......
We all know who's behind it- whether its intentional, illegal or just bad marketing do you think we can all stop discussing it.  
I'm switching companies in two months.  Everyone else should do the same.
Stop playing their game, don't ring back, don't get mad, don't abuse innocent Telstra staff, just take your business elsewhere- simple.

Definately Telstra marketing.

when they do answer they are pushing a phone upgrade and a plan upgrade also.it's not telstra directly but an outside company with all your details. my plan expires in a fortnight and they knew all my codes and usage of my number.I'm disconnecting this number right now due to barrage of calls i have received in the 8 calls from 5 different numbers in the 0388 range. it's getting out of hand and i am trying to work.

Yeah they kept ringing me too.  If you don't get silence and someone actually talks to you they try to get account passwords and personal details. I rang Telstra enquiries to report a phishing scam but they admitted it was a Telstra internal number. Same for (03) 8808 1400.   It seems they have autodialers ring on behalf of their 'customer support' people.  Supposedly it is a 'courtesy call' to see if you are getting best value for your account.  Don't mind a one off courtesy call by a real person.  But autodiallers that don't leave an explanatory message and then keep ringing you.... that sucks.  And what if you're overseas on international roaming, do you get charged for the international leg of the call like when someone else rings you?

Cheers, Richard