Indigo Airlines — Boarding pass issues

Address: Kelambakkam chennai, Tamil nadu

My name is Sabyasachi Kabiraj. I have booked indigo flight for Patna to Chennai. I reached airport by 1.40p.m.and my flight was on 2.35p.m.Indigo airport authority refused to give me boarding pass. As boarding time was over. But according to airline rule boarding pass should be available before 29mint before leaving the flight. Indigo authority not given boarding pass and they diverted me to book connecting flight.my ticekt pnr was YQ7H5J.