Just another Payday Loan scam or Debt Collection scam.
They're pretty ignorant people.
If you get a call from this number, do not answer and do not call back. Unless you want to hide your caller ID and harass them which can be fun. :)
But if for some reason you do pick up, ask for proof of debt. They have to provide it............It's the law! and it has to be through the snail mail, not email.