I'm a plaintiff tenant sueing a landlord, I have city building inspector violations and unanswered letters to the landlord. Two NOVs, one for a concealed uncovered multi-flue hole in the kitchen wall, and one for the installation of a window without a permit. Do the NOVs have to be certified? How do I submit this material correctly. Defendants have recently stated that I have no evidence, why are they saying this? What can I do about it?