Experian says they have already investigated and verified its accuracy

Experian says:"We have already investigated this information and credit grantor has verified its accuracy. Please refer to the personal credit report you received for the name, phone number, and address of the credit grantor who verified this information. If you still believe the item is inaccurate, then we can add a statement of continued dispute to your personal credit report at your request, or you may wish to contact the credit grantor directly to resolve your issue. If you have additional relevant info...." I do have the personal credit report I received and under "Credit Items" It gives me the name and address of AFNI, INC. (the collection agency) "No phone available" and "Original creditor: CHARTER COMMUNICATIONS" So it seems I should send out another registered dispute and specifically insist on this Signature and legal chain of ownership you made mention of so that I may present Experian with additional relevant info. Just who do I send this request to, AFNI or CHARTER? It also stands to reason that if AFNI had a legal claim they would have responded to the 1st registered letter. What do I do now?

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send the dispute to to charter and the CA