This sounds fishy. You didn't know you had a past due bill from Tricity? I am disputing a bill from Tricity now with my insurance, they double billed me and my insurance refused to pay it. I think you should have looked into that further before paying it. And no way are those people pleasant. I tried to tell them this was being sorted with the Hospital and Insurance and they keep calling me non-stop. Also, the amount that they claim is owed is almost twice as much as the bill. Valerie is rude as hell. I would never pay bill collector and I would the original debt at the source.