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A debt collector is not requried to provide the consumer any notice prior to reporting to a CRA.
While case law has held that reporting to a CRA is an act that triggers the obligation to send dunning notice, the fact that they did not do so is only a violation of their debt collection practices obligations under the FDCPA, and is not basis for requriing any deleteion of their credit reporting.
You can file a complaint with the CFPB over their lack of timely dunning notice, and perhaps the CFPB will give them a slap on the wrist, particularly since they did eventually send the notice. They most likely sent it when then recognized that they were not timely.
However, if you are seeking deletion of their reported collection, you will need their good will, so I would let the lack of timeliness of their dunning notice pass.