Vistara Airlines — name change

I booked my ticket yesterday but by mistake i mentioned there my nick name but same has been confirmed within ten minutes with vistara airlines and make my trip customer care. I requested them please change my name but they did not agree for this. I will lose my whole amount. My flight is from ahemdabaad to delhi. I sent my all the documents like as my id proof residences proof. I request you that please change my name in ticket. My pnr number is taqo4z.

If possible please change it i will be very thankful to you for this

Regards
Devinder kumar
[protected]
[protected]@gmail.com