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I'm in a similar situation with Sprint. Do you have any advice?
If the collection authority of a debt collector is terminated and the debt is still unpaid, then the debt collector is required under the credit reporting agreement set forth in the CRA reporting manual to delete their reported collection.
File a dispute with the CRA, including evidence of termination of their collection authority before you paid the debt, and request deletion of the reported collection per the credit reporting policy set forth in the CRA reporting manual ("Credit Reporting Resource Guide").
Yes, you can attempt to obtain documentation from the OC as to whether they had terminated their collection authority.
Another option, since the debt collector told you directly that their authority had been terminated, would be to file a direct dispute with the debt collector, asserting inaccurate reporting of a terminated collection. If they agree with your assertion, as docmented by their statement, they should delete as a result in their finding in the direct dispute.