I seen bed bug insecticide at the store here. I don't know how to suggest but I will try. I seen infestation tv show, the bugs can live/sleep far away from the bed, so clean/spray odd corners of the closet, so get a bugman professional. They like crevices, maybe get a resurface premier paint that kills mold and spores, they have a wall paint that kills viruses, really, but do paint all the house's walls the floor the ceiling at the same time, so get a professional house painter. In my mind, this should work, don't offer them a place to hid, get rid of all rugs, so take pictures. Than bill your landlord, free lawyer for this kind of thing do your paper work right, and get proof!, maybe talk to a lawyer first. Hate bugs, these are not your friends!