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It sounds like you sent a letter for disclosure of information in your credit file under FCRA 609(a)(1) if you paid the $10.50 fee under FCRA 612(f).
If that is the case, it is NOT a DV request under FDCPA 809(b) or a dispute under FCRA 611(a),. It is a disclosure request for what is in your credit file. That is handled totally by the CRA. Disputes under FCRA 611(a) never require payment of the disclosure fee set forth in FCRA 612(f). This looks like a lack of meeting of the minds, in the best case, or total CRA incompetency, in the worst case.
If a request for disclosure, it is totally inappropriate for anyone to then come back and ask you to verify anything.
Your letter to the CRA should not even have involved the OC in any manner.
I think what happened here is that the CRA treated your request as a dispute under FCRA 611(a), and thus forwarded it to the OC.
What did your original letter to the CRA say? I hope you did not mention FCRA 611(a)?
Either way, do NOT call them. The CRA either provides the requested information, if a request under FCRA 609(a)(1), or the creditor verifies on their own if they treated it as a dispute under FCRA 611(a). That is their duty, NOT yours.