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If the OC has sold the debt, they are obligated to promptly update their credit reporting to show $0 balance.
You can give them an informal call to remind them of their obligation to update the debt balance, or you can file a formal dispute.
It might be an excellent time to contact the new owner and offer to pay in exchange for their agreement not to report thier collection on the debt.
You can send them a DV, but they could reply and then simultaneously report.
I assume that you dont dispute the debt?