Spice Jet Airlines — not allowed to board the flight

I want to raise a complaint on spicejet airlines for not allowing me to board the flight sg-8189 on 18th june 2018 from delhi to pune.
I had reached the airport 40min before departure of flight but the person didn't allow me to board the flight saying that you are 5 min late.
I want to take action against it and help me in getting refund of the ticket.
Contact me on the email id for discussion.