makemytrip.com - makemytrip default booking children as infant in spice jet flight

I have booked * tickets from makemytrip and one ticket is child (* years old ) named sunang chakma and he has been mentioned as infant in the tiket but I booked as children and when I reached agartala airport spice jet counter staff charged me ***** for current booking ticket to carry my son to flight. there is no mention in the attacked ticket as chidren in the cancellation and date change and there is infant . I have been charged ***** by the spice jet staff with current ticket of pnr no M*J*MM and Z*p*HR from agartala to delhi and our pnr no were CBZRPD during * tickets bookings....so please kindly stop the fraudulent looting by the makemytrip and spice jet staff by this practice .on **th oct **** and try to refund my amount