As @PhilT stated the problem is that for the suggestion to block these numbers is that innocent users will be blocked because their number has been spoofed. Not a good outcome and it might take a long time for the “bad listing” to be fixed.
One issue that may help a little which I have discussed before is to make Australian numbers only available to “real” Australians ie people and Businesses with real Australian credentials. Germany among others already do this for their numbers, it isn’t perfect but it does reduce the incidence. Currently VOIP services and that means any VOIP service here or overseas are allowed to provide Australian numbers to non-Australians. They purchase these numbers from the Australian Communications authority for very small amounts for each number (they usually buy in batches of 1,000 or more). Then a VOIP user can churn through the numbers for very little cost to change them as often as they like. The VOIP service gets paid so they are happy as they make money, the user is happy as they can use as many numbers as they are willing to pay for, the Australian Govt are happy as they made some income and the Australian user is unhappy because they get phoned by different numbers all the time. This isn’t the only reason they end up having so many numbers to use for these scams but it certainly doesn’t help.
A topic that has covered Caller ID Spoofing that may also offer some insight into the issue:
