Yeah I got a call from this number today and 3 other times. Anyone know who it is?

Keep getting called, no messages r left, don't know who it is?

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I've had three calls this week from numbers that aren't in my phonebook, (03) 9838 2018, (03) 9937 7800 and just this morning (02) 8114 3800.
Decided today after missing the third one that I would google to find out what's going on. From what I've read it seems like they're all dodgy companies claiming to be calling on behalf of Optus.
I'm on Optus prepaid and it sounds to me like they've been giving away my personal details.

I just (five minutes ago) recieved a miss call from this number, tried to call back and she said they will continue to contact unless you leave your name and number, so they can take you off their list or something. :-/

I keep getting calls from this nuber and 02811...... no messages left or when they are is in a weird spooky voice