I got rid of most of the Indian scammers by getting rid of my landline number. Now, only rarely do they call me on my mobile, and when they do I stir them if I have time for some entertainment.
On one occasion, the scammer wanted to speak to my wife. I told him he can't because I murdered her ten years ago, after I caught her on the phone trying to scam money from my aunt, and I only got out of prison recently. After that the number of calls noticeable decreased.
The Microsoft help desk is a good one. Tell them "I am using the very latest version genuine, and I mean GENUINE, copy of Microsoft DOS. Now, what do you want me to do?" The imbeciles get totally confused because don't know what DOS is, but still try to help you find the start button.
Once I preached the Gospel of the Lord Jesus Christ to the scammer and he came clean with a full confession, admitting he was a scammer and a thief and will go and read the this book called the Bible he heard about.
As for spoofed calls, I get them occasionally. I think the laws around the world have to come heavy on scammers. And I mean heavy, like life imprisonment without the possibility of parole, with 10 hours per day installing Windows 95 diskette version on an old PC continuously in return for food
.