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You should probably pull your CR's to see who is reporting the debt? Whether its the OC and/or the CA. If both are reporting, DV the CA so they stop reporting and deal direct with the OC. As far as settlements, they look just as bad paid as they do unpaid. Granted, a thorough underwriter will see that you attempted to settle debt. I would try a PFD with the OC (once verified that they still own the debt) If you get nowhere with that route, the only thing left is to Settle/PIF then send GW letters out daily
Good Luck!