I get the call also. From what I've found, they are PayDay America scammers; they claim you have a debt owed to them, and they are verbally abusive and threaten you with lawsuits to give them money. They have thick Indian/Middle Eastern accents.
I haven't answered their call. I never took out such a loan, but for some reason they call me. Must have bought a list somewhere, as it is my cell they keep on trying to call. I don't know how to get them to stop calling; they call for a few days in a row (I have the number saved and named "Scam" when it comes up), and then it is 2-3 months, and nothing. Then they pop up again.