Keeps calling about a 'case' number, they don't appear to know my name and I let it go through to voicemail each time.

I called back number (03) 9017 6544 rang 4 times then gets disconnected automatically.

just got the same call from "alpha legal" saying i owe sensis money,,asked my name to which i said yes,,,and gave my email which she had to ask for if she had info she would of known,,,except my email is plastered all over website with my phone number anyhow,,,,said she was after outstanding money from a dispute ages ago-----i used to get alot of calls saying they were sensis an i suspect this group of callers lucked out previously an keep poking at this---thank goodness im stubern as i am ----feelings of massive scam happening,,,,,,said she would email me of our conversation an never happened,,,,,

Just answered a call from the above number.
Female caller asked to speak to Tony.
I said there is no Tony here.
She then said sorry and hung up.

I know my staff..... and we don't have a Tony!

I called back number (03) 9017 6544 spoke to a guy who said company name is Alpha Legal.

They just rang me saying I owe $6000 for sencus adds