Indigo Airlines — Threating & misbehave to my son 8 yrs old

Address:

Raipur, Chhattisgarh

During traveling from Hyderabad to Raipur on 18/08/2016 flight no 6E466 and PNR no BEH87H
A person named Vikas Kumar sitting beside my son harassed him in such a way that he is unable to talk and crying continuous. And he misbehaved with other passengers and air hostess too.
Before landing Raipur complaint has been wirelesed to airport authority. When authority person came to take him he refused to go and used vulgar words publicly.what action taken from ur side????