They have invaded. Disgusting, evil, creepy-crawly, dastardly, hole-finding, crumb-eating COCKROACHES. Argh!
I need help. It all began a few weeks ago, when it was just one of them. One, crawling across the counter. Death by pot holder for that one. Then there were more. An ever-increasing tidal wave of roaches. They are now coming from underneath my counter-tops, in cabinets, by baseboards. They are all over the kitchen, and have begun moving a lookout patrol into my living room. (Although I don't think they're very smart...they sent an expedition to the freezer, and that platoon died).
I don't understand, DH and I aren't unclean people. Sure, a little clutter here and there, but nothing that warrants this. I've had the apartment complex spray twice now, and the bugs still live. I think they've moved in because of my next door neighbor. I don't think he's the cleanest person, and they're coming through the wall between our apartments. I've politely told the complex of my suspicions, but I don't think they can spray him without permission.
I'm at my wits end. Spraying doesn't work, I've set traps, I've squashed them. Does anyone have any advice to eradicate them? I will try anything, I'm so afraid of them getting worse or moving camp to the bedroom or something. 
Thanks in advance for any advice!