First Flight Courier — stolen my cheque sent by courier & cashed my money after alteration

Address:

Gautam Buddha Nagar, Uttar Pradesh

I have complaint , I had send one Doc cotaining cheque from singapore to india (noida) . But this courier never reached to destination and my cheque missed by first flight guy's. Some one withdrawn my cheque and trasffered to another account. Now i m fighting with Axis bank and RBI.
At the mean time. I want compensation of this missing and my mental harrasment. Firstflight not provdingany update and compensation. Please help me to get the compensation first flight.
My cheque amount is 354000/- . the whole amount is encashed by unknown person after alteration.
This is really very bad service provided by first flight.
First Flight courier receipt number - A78344750
My Axis bank chque number - 075962

I sent my doc from singapore to noida. And this account payee cheque was for my builder.

Pl help me for this issue.

Thanks,
Pankaj sharma.
Ph - no - +[protected]
India phone - +91- [protected]