I've recently been contacted by a collector for the difference in a debt that was settled for less than the amount owed about 6 months ago. I sent them a copy of the settlement letter stating that the debt was settled and considered paid. Can this collector pursue the difference in the total owed? After submitting the settlement letter, I received another letter stating that I would be contacted 'after their investigation' is completed. This letter stated that as a collector, they had to right to assess my assets, current creditors, checking account, etc. to determine my ability to pay.