What is the best way to a dispute debt from a collection agency if the debt shows as resolved closed or written off from the original creditor?

Writing off a debt is not forgiving it. All that means is that the debt is no longer active in their accounting system and written on their behalf into another. You can't dispute that which is still owed.

Its like saying you don't have to send your mother a birthday card because she moved from Minneapolis to Phoenix...she must not have a birthday because you have never celebrated it in Arizona.