I’m not sure it’s only me but I receive a few spam calls a day almost every day.
Phone numbers of callers look legit (like Aussie numbers) so I pick up, sometimes it’s hung up upon picking up or it speaks a foreign language (mainly Chinese pre recorded) so I have to hang up. I don’t recall I have ever had a spam call last year but it’s different this year.
Is it because the government CovidFree app got hacked and possibly sold to the third party?
Good advice but sadly this won't protect you from the calls OP is taking about.
These are spoofed numbers likely from overseas.
For Android users, you can install the Google phone app and message app and use it instead of the built in app.