Indigo Airlines — no help desk

I had a flight booked from patna to delhi on 21.10.2017 flight 6e 4367 after reaching airport before 25 min of departure we were told the counter was closed and we had to rescheduled the flight by paying the charges again can u please explain why was the counter closed before 30 min of flight departure we had very bad experience and there was no responsible person at the airport
We will now not prefer travelling by indigo and will share our experience with our friends n relatiives too to avoid using indigo in future