I get tons of those calls every day where I work. A lot of them come come from off shore sweat shops made up of exploited labor, indentured servants, debtors, and those who have no means of support. To coin a well known phrase: “Ask not for whom the ringtone tolls; it tolls for thee.” Take heed.
Sounds like scam calls. If you get a call from someone with a thick Hindi accent and a name like Robert Wilson... beware.