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The term "re-aging" has no precise definition under the FCRA or the FDCPA, and is generally used to refer to the updated reporting of a later date of first delinquency (DOFD), which then extends the exclusion date of a collection or a charge-off.
The exclusion date of a collection is determined only by the DOFD, and is the same regardless of whether any payments were made or reported.
What is the reported date of first delinquency that was reported by the debt collector?
As an aside, if they reported a payment that you did not make, you can certainly dispute the accuracy of that reporting.
The relevance of a date of last payment is that payments can, under most state SOLs, reset the running of the SOL.
Thus, they may have reported a payment as later basis for supporting an assertion that the SOL has been reset.
I would recommend disputing the accuracy of that reporting, and getting the matter clarified now.
However, it does not re-age the exclusion date of the reported collection.
Collections can be removed for reasons other than exclusion by a CRA.
The debt collector could also have reported a deletion, which is not credit report exclusion.
Credit report exclusion of a collection is no later than 7 years plus 180 days from the DOFD.
The DOFD, and the DOFD alone, controls credit report exclusion of a collection.
Removal of an OC account at 6 years from intitial delinquency would almost certainly be due to the creditor having reported its deletion to the CRA, and not due to credit report exclusion by the CRA. The earliest exclusion of a delinquent account would occur at approx 7 years from the DOFD.