Myself Sneha, have also encountered the same problem. Its been a month I am trying to get an appointment for applying but couldn't get any slot any time. I wonder how do agents get their slot?? We are left with no option to go to an agent and unnecessarily waste another 500 bucks for nothing.
Manual appointment facility is also of no use since the guards dont pay any heed to your queries. I am sure many more people who tried filing for passport without the aid fo an agent, had nightmares simply trying to pull things on track.
I sincerely request to look into the matter.