Indigo Airlines — Money stolen from flight check in baggage

I was traveling by indigo flight of 1820lt/[protected] from patna to goa (via Delhi)6E 178 / 6E 505.
When i reached goa and later opened my check in luggage, i found out that someone had throughly searched my luggage.Money more than 15000 was in the baggage was stolen.
Customer care said why didn't I raise this issue in the airport, how can anyone raise the issue when we don't know what's missing? Baggage looked fine from top(who checks baggage in the airport after receiving, this is really insensitive from indigo customer care)
Please help.