Phone from within Aus: (02) 61891705 (Not a free call)
Phone from outside Aus: +61 2 61891705 (Not a free call)
Should be easy to bait as I don’t believe they will be receiving many calls since their number isn’t a free call.
hxxps://d1bfadgrxw5ht8.cloudfront.net/assests/eng_ff_auth.html?mid=1869&number=61-8-7150-1869&rb=JS8a16efa46f9c414386890c963d2e4007&cid=J1LaXvwu3nY&pid=128070_132684&bid=0.006&ip=61.68.124.222&city=Brisbane&url=fastsuppirt.com&network=aaumscomboclf5035&p_num=02%206189%201705
Yep, just scripted them with load of calls. One of the recording: Dropbox
I also have a script in case they try to call back my number. When it answers it keeps telling them "You are a 'stoopid' scammer. Do you know it ?" till they hang up!
@lucabrasi#47130 Thank you for calling them up, What do you use to call the scammers?
I use a Python script that taps into Twilio API. You can record a voice script for outgoing calls and incoming calls received using their TwiML markup language as well as record the calls.
TwiML basic example below when they try to call me back:

I can then bomb their call center with different calling numbers:

Twilio gives you $20 free credit when you subscribe, if you want to have multiple numbers to call from then it's $1 / month for US numbers.
I believe there are free VoIP callers, but Twilio API is feature rich and easy to interact with in Python, PHP, Java, ...