I found this card on my door. It has a case number a phone number and the name of an investigator. I don't know what it is, but before this card got on my door, my brother owes a lot of money to people and is now in debt and hiding. The insurance agencies and debt collectors have bombarding my house with a lot of calls. So, does this have to do with the note? If, so what do they do? How do they operate? Do they come again?