I am assuming that you disputed the accuracy of the balance, asserting it shuld be $0,, which also would require the collection to show paid and closed.
I also ssume that your dispute did not include any documentation, only an assertion.
If they then verified, you have a completed dispute.
You can dispute again, but in order to be entitled to a new investigation, you must include new documentation that was not previously submitted.
Proof of payment, such as a cancelled check, money order receipt, etc., would be on point, and entitle you to a new reinvestigation.
Since only the debt collector is reporting, then verifcation is made by the debt collector and reported back to the CRA.
In their verification, they presumably contacted the OC for their input, and apparently received confirmation that the creditor verifies no payment was received.
My next step, before disputing, would be to call the OC and have a chat with them.
If they inform you that they confirm payment, then they would likely also inform you that they have no active collection assignment with the debt collector.
That would be an additional basis for any dispute, and I would want to include that confirmation from the OC if you can get it.
The DV process is not the way to go.
Even though they apparently did not send dunning notice, and thus a DV would be timely, there is no period for or requirment to respond to a DV. They can simply accept the cease collection bar and never respond.
I would use the dispute process, as it has a 30-day reinvestigation period.
