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As for the effect of your DV request, if you never received a dunning notice, then your DV request was timely, meaning it imposed a cease collection bar, which remains in effect until such time as they send the requested debt validation.
The FDCPA imposes no period within which a debt collector must provide debt validation. They can choose to delay or never respond.
Violation occurs if they conduct any collection on the debt prior to sending validation.
Yes, there is case law that provides basis for assertion that reporting to a CRA is a violation of the cease collection bar.
You can either file a complaint with the CFPB of the violation of FDCPA 809(b) or you can file a civil action for the violation, and collection $1,000.
Alternately, if you feel that you can make the statement that you never had any debt with the asserted creditor, then you can obtain a block of their reporting from your credit report by filing a police report and following the identity theft procedure set forth in FCRA 605B. See the sticky post in the upper section of the General Credit Topics forum for a detailed discussion of the Identity Theft proceess.