CRA policy instructs furnishers (creditors and debt collectors) not to delete their reporting based on payment of the debt, regardless of whether you pay via the creditor or the debt collector.
Neither the FCRA nor any federal regs require deletion based on payment of the delinquent debt.
Thus, there is no basis for a dispute of accuracy of the continued reporting.
The debt collector is required only to update the status to paid, and the balance to $0.
You can request that they voluntarily report deletion to the CRAs, but that is purused via good-will requests, not disputes.