As explained numerous times, there are a LOT of reports on a daily basis, it takes time to go through them all, bots are constantly being dealt with anyway, it's just not as simple as banning everyone suspected, plus they make new accounts constantly, you're by far missing the bigger picture.
Bear in mind that not every legitimate player will respond to random people PM'ing them ingame either
Constructive reports are always appreciated, constant badgering and attitude about them isn't