Kindly reply : Amount reversal of flagship programme

Respected sir,
I have subscribed today for the flagship prelims programme. I made the payment first time through internet banking. The amount was debited and due to internet failure i did not recieved any recipt. Again, i made the payment through debot card and it succeeded. I want to know how i will get back my reverasal of rs 5997 that i made through internet banking.

Kindly reply as soon as possible.