This is another tactics used by the Ombudsmen when they can’t answer a question.
They threaten to ignore future correspondence. What usually happens is that the Investigator or Assistant Ombudsman involved will often threaten to advise them Ombudsman to stop answering your correspondence if you persist in asking questions that they can’t answer.
The Ombudsmen also often use this tactic. They just stop answering your letters if they don’t like the questions.
My argument has always been the same, why don’t they just do their job and resolve complaints in a reasonable time in the first place? Ironically if they did that there would be no questions they couldn’t answer.