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Even if, as the amended Ethics Code now requires, a debt collector that is unable to provide verification of a debt ceases collection efforts, closes the account, and notifies the credit grantor, client, or owner of legal title to the debt that collection activities have been terminated because the collector could not provide verification of the debt, the credit grantor, client, or debt owner might choose to refer the account to a different debt collector. Thus, although the consumer will no longer be contacted by the first debt collector, he or she might receive collection calls and letters from a different debt collector.
That says to me that if they can't validate, they stop collection efforts and then someone else can try.