There are sleazeballs flying around in private jets that got them buying debt for pennies on a dollar. Think about this, there are obviously many ways debt can be bad, I can confirm that some of it is "bad" because it IS NOT OWED. We got calls for literally years from from such an outfit, and no amount of reasoning, letters etc. could stop it. Finally out of desparation I began engaging in obscene and lewd conversations with any woman who would call, and depicting male callers mothers and wives in the most abusive and graphic scenarios. It worked after they ran out of people willing to call our number.
I think it sad that we must resort to such behavior to get them to stop. And I think that behavior justified.