If this is a loan by a licensed lender, and it complies with the Illinois statutes regulating high interest loans, it can be enforced. If this is an unlicensed Internet lender, the loan is void, you owe nothing, and you are entitled to get back anything you paid. You can in no event be charged with fraud or any crime. If a debt collector made such a statement it is a violation of the Fair Debt Collection Practices Act. The only problem is that many people who make such threats are scammers. Report the person to the FTC and Attorney General.
This is a standard tactic of payday loan companies, I would suggest you engage attorney immediately and to have them to term and whether or not the various collection laws have been violated.
They would try to charge you for fraud but its unlikely unless you made a misstatement of fact in your application that they could but yes they can sue you civilly for the debt.
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