These are people (Harris & Harris or Rickman & Rickman) who have purchased a debt from a medical facility.  My understanding is that the facility which you actually owed the money to has already written off this off as a bad debt from their taxes.  Meaning basically if you pay these fraudulent companies it's just money in their pockets and the medical people won't get a penny of it.  Don't let these crooks have a penny of your money!!  It won't go where it should.  If you owe a medical bill, and can make amends, pay it directly to the doctor/hospital that you owe.