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If the original creditor has sold the debt to a debt collector, they can no longer accept any payment, as you no longer have any debt with them.
When an OC sells a debt to a debt collector, they are requried to immediately update their reported debt balance on their account to $0.
That does not mean that the debt is paid. It means that there is no longer a debt owed to them.
You cannot offer a PFD to a creditor after they have sold the debt.
Any payment must be made to the new owner, and any payment made to them is not basis for requring deletion of the OC account or of its reporting or prior derogs.