That and others. Sometimes I answer and just say "Bhen Chod" which usually results in them hanging up right away.
https://en.wikipedia.org/wiki/Hindustani_profanity
I never thought about using hindi profanity and racist slurs. Street shitter and pajeet usually get the job done but thanks. I'll answer the next one. :)
Another good one I saw the other day is when you get random texts or messages on something like Telegram or whatever. They will have a picture of a white person with a white name like Samantha Jone. Reply to them with "Your name is Samantha Jones in much the same way that my name is Maninder Patel" and then they just delete the account they contacted you with.