National recovery agency keeps calling to collect a debt they say is from XXXX XXXX, 2009. They say the bill XXXX for {$420.00}! They have never sent anything in writing ( no bills or letters ) for six years! I have never received a bill XXXX! I called XXXX and they have no record of this bill or of me owing any money! Iwas seen at that hospital and all bills were taken care of through our insurance! They provided an account number which does not exist!