You would just get called from an agent (bot) based in your country. There’s no easy way to prevent that. Fraud is massive and it’s becoming cheaper and easier to run at scale.
As a result, it's very difficult for me to use a lot of Chinese websites and it's a pretty sizable barrier to hardware development when Chinese citizens can just download the relevant datasheet off some Chinese forum in 5 minutes, but I have to sign NDA's with western companies or figure out how to WeChat a Chinese OEM to send me their datasheets.
Phone numbers in Australia are also all tied to ID. If there is a will to fix the system, it can be done.