Insulate and fill hole in wall that was for cables?
you don't say what the material is that has a hole in it. Great Stuff works well usually. Let it dry completely (for like a day or two). Hack saw blade (no saw) cuts off excess flush with surface. May want to push in filler to create a dent to allow for cap/finish agent. Spackle/skim over with your favorite skimming agent (something that matches existing surface). I have used vinyl spackling for smooth stuff and sanded, cementicious products for stucco and rock, I'ved used Bondo, Durham's Rock Hard...etc., etc. Great stuff is your insulator and filler then you just need to skim/cap/finish it then paint it.