I feel like the US is in a position to simply have some police deliberately fall for these scams, then wire over the $25k as the scammer instructs, then trace that money as far as the indian border, then demand the indian government repay it.
The indian government can continue tracing and find the scammer to get their money back (hard), or just shut down the call centers (easier).
Yes, I know this isn't the way international disputes work right now. But I think the US is in a position to make demands like this, with the threat that US borders will be closed to indian nationals, goods and investment unless india pays up.
Repeat however many times are necessary to solve the problem.
Hit them where it hurts: Ban all family members of anybody in Indian government from entering the US for any reason. Not for school, nor a job, nor even a short vacation to visit other family members. Limit this ban to Indian politicians and their family members; most Indians should be unaffected.
Everyone likes to say “but would Apple would lose the $100/yr from all those hobbyists.” How many hobbyists do you think are out there right now paying $100/year just to load some apps on their phone? Can’t be more than 1000. Even if it were 10,000 that would represent $1 million/yr in lost revenue for Apple. That’s less than a rounding error on just one quarterly report. They really don’t care about that!
Apple treats their users like a nursing home treats senile people.