I'm getting these threatning email about a payday loan they said I haven't paid

If you have a payday loan they may be discharged in Bankruptcy.  A complete analysis of all of your finances is probably needed.  Payday loans have the advantage as you have signed an loan agreement at a very high interest rate.  An old payday loan may be settled.  If not litigation has commenced now is the time to act unless you have much larger financial issues.  If you do, consult with an attorney who can review your finances and create a plan of action.  If the payday loan is your only issue, and it is valid, try to negotiate a settlement.