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I would not immediately dispute. You can likely avod a pending dispute flag.
The obligation to have reported the update clearly resides with the creditor, without your need to file a dispute.
Under FCRA 623(a)(2), a furnisher is required to promptly update any information so as to maintain its current accuracy.
Promptly is not specifically defined in section 623(a)(2), but reasonably would be in their next regular reporting to the CRA.
I would call or send them an informal communication reminding them of their obligation to have promptly updated the balance to $0, status to paid, and collection as closed.
If they dont comply in their next reporting cycle, then I would proceed with a formal dispute.