http://h7isucmawckzflxhipflydxvxpaytk5fozfk5immffg66rhboc74yxyd.onion/doku.php?id=audio_and_video&rev=1564932239
I’d hope that they’d welcome your security-aware stance, rather than seeing you as a nuisance. Some people like to play these callers along, pretending to do things, to tie them up, to stop them calling others, or else proudly say “I’m sorry, I don’t run Windows, I run [and whatever they might be running on their computer”].