Indigo Airlines — Boarding has not provided before one hour

On 16 July, i traveled from Nerobi to Bombay by Kenyan airlines, it reached with some delay at 17:00 to Bombay, i reached within 45 minutes from international to domestic, enen i reported counter of Indigo at International airport, but they send to me domestic, and i reach 17:45 at domestic airport, and my booked flight was at 19:00 hours PNR XF8HNH, from Bombay to Lucknow. but they have not given me the boarding, and i missed the flight, i feel that girl staff doing work as they are enjoying in Picnic, even from coming out from that terminal, i search one staff who will take me for exit pass, than i can come outside.