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The CA is reading from a "script," and probably knows how to feed off your emotions. Bad combination for you.
CO is just an accounting term. Means unpaid/150+days late or more, typically.
Whatever the last status of the OC is, that's what the CA can report.
Keep calling the OC, and ask for other "higher ups," to escalate this. You'd benefit from retraction, unless their strict postion is that the CA does all their in house collection activity. Only takes one person to hear you out, and say they'll play ball.
Last option. Pay, and GW the heck outta them.
You'll get it.
A CA can't charge off anything. They are collecting a debt for the OC. Only an OC can CO a debt.
They can cease collections and return it to the OC. That would mean they would have to delete their tradeline per the credit reporting guide.
Yes, it would be a good thing to be returned to the OC.
Once it was, you would immediately contact the OC and take care of it before they had a chance to assign to another CA.