These people are scammers. They are Hindu Indians who are incredibly rude on the phone and can barely speak English.
They make up "debts" that don't even exist. If you try and ask them about it they become belligerent and start swearing. It's ridiculous. A common theme I've found is that if you've ever ordered anything online from those online pharmacies based in India (i.e.
"US Pharmacy"), they probably sold your number to the scammers.
It's absolutely disgusting the way these foul-mouthed goons are allowed to call us in America and harass us non-stop.