[Resolved]  Indigo Airlines — GST

My brother had a flight from Dumdum International Airport to Lokpriya Gopinath Bordoloi International Airport ( CCU - GAU) on 12th August 2022 PNR: OUHHXH Flight No: 6E-447.
It was a business related flight with GSTIN was also provided which is 21AJMPN4655K1ZX registered to my company A. P. ENGINEERING.

As the tax invoice came to me, I saw that there was no GST was levied from the flight ticket. All of the charges were included under Non taxable/exempted value. Now, how I am going to get the tax credit? It is a big amount and the IndiGo Customer Care Associates are not helping me out on this. Just halting and then they disconnect my call. I am getting harassed. Please help.