Indigo Airlines — Surname change from mother surname to fathers surname on flight ticket

Respected madam/sir i tried several time from your customer care number regarding changing of surname but still negative response from your officials hence again i want to state that in the ticket for indigo airlines 6e-6204 travel date 12th june 12.25 hrs, passenger 1# sunanda padhy, 2# anvesh padhy, 3# suchitra padhy, i want to change the surname of the 2nd passenger as anvesh panda (Son of sunanda padhy, father name anil panda) instead of anvesh padhy as by mistake wrong surname was entered and i tried several times to indigo customer care executive but they casually reply to cancel the ticket with cancellation charge as rs. 2000/- and re-booked the same with higher cost. I also contacted my booking agency makemytrip but they replied, only airline will be able to change the surname. Please suggest as this is the not justice to consumer because in railway also option for correction of the name gender etc. Passesnger 1# sunanda padhy is mother of anvesh panda (Father name: anil panda) and can carry birth certificate which has both father and mother name. Flight details guwahati to kolkata flight number 6e-6204 (Indigo) departs guwahati on 12/06/17 at 12:25 hrs arrives kolkata on 12/06/17 at 13:40 hrs fare details total fare inr 8145. Hence please consider the same if no any positive response from your end then i have only option to ask to consumer forum either ministry of civil aviation/ pmo through our chiif minister/ ourlocal representative because such type of behaveiour is not a justice with common people. Please let me know if i need to provide more details like booking id and pnr. Sujata padhy, email# [protected]@gmail.com