Indigo Airlines — Auto cancellation of ticket

Address:

Jamnagar, Gujarat, 361001

I have booked two ticket of my family in view of my elder brother death on 27 Feb 16. One ticket from Ahmadabad to New Delhi and second ticket from New Delhi to Varanasi After complete booking of first ticket whose PNR no. is RC318Q, I logout / Closed your website page then i proceeded for booking of second ticket from New Delhi to Varanasi whose PNR no is RC318Q. When I reached Ahmadabad air port for boarding then indigo staff told me that your first ticket has been cancelled and you cannot board in the 6E 158 flights. For some time i was really shocked how this happens. I booked again another flight ticket from Ahmadabad to New Delhi .I want to know that how my first ticket become cancelled without giving any cancellation command. Plz take some serious action against Indigo to refund of my total money which is Rs 8181.00(Rs Eight thousand one hundred eighty one only) .