Spice Jet Airlines — Check in closure before time

Address:

Ahmedabad, Gujarat, 380001

Hi
My ticket was booked in sg 636 for ahmedabad to mumbai.
Flight time is 5.35 but the staff will close the check in on 4.49. I was in the queue
One other passenger travelling with diffrent flight is standing in front of me.
When he is getting his bording it was 4.51 and the staff refuse to give me my boarding.
It this a fair with tha passanger.
I need my money back with the airlines at any cost...