My name is Jelena Kaja (from Estonia). I am super worried about your computer.
I ring Mr Julie Bishop and I have fixed her computer super good.
It is not illegal for me to fix your computers in my country. Estonia is a proud and free nation.
All my friends fix computers. Next time I call, I give you super good deal.
Seriously though, consider not answering calls from Unknown Numbers or obviously from overseas. If you don't have Caller ID perhaps get a phone that does or a little device that adds it.
Right. So we just accept that the current technology is not fraud free and our highly paid Foreign Minister cannot use the meta data service to find out what the hell is going on - Maybe TDM will do a better job?
If it makes you feel any better, you could get the calls forwarded to your mobile phone, and run the slightly illegal voice recorder by Green Apple. Try to seduce as many of the operators as you can, by offers of money and migration. Edit the lot togther and put it on youtube.
Apologies for haveing a bit of fun at your expense. I'm not sure what TDM is but nuisance phone calls are our problem to handle. They originate in countries that we have zero legal jurisdiction. If you want to reduce the issue then either don't answer or just hang up when called.
Its not an Optus problem though. Complaining about nuisance calls is a bit like complaining about Toyota because your neighbour beeps his horn at midnight and what are Toyota going to do about it?
Aside from the stupendous cost in trying to find a call centre in a foreign country (although your clue that they had an Indian accent will no doubt make thinks faster 🐵 there's the matter that there is no legal recourse because Austalian laws don't extend to other countries. Julie Bishop isn't about to start extraditing Indian Nationals over a nuisance call.
FWIW as I mentioned if the phone number ID is blocked or foreign then just don't answer. Its almost never a call you want anyway.