how to stop cold calls to mobile & home phone in victoria, australia?

Register your home phone and mobile phone with the Australian Government "Do not call" register. This is free but you will need to renew the registration every three years. Some categories of cold callers (e.g. charities) are exempt from the "do not call" restrictions but it will block most other types. Register on line, by phone or mail.

https://www.donotcall.gov.au/

What's a cold call?