MakeMyTrip India — refund not yet processed

I had booked a bus through make my trip id using net banking. I selected a seat and filled the details and proceeded to payment. And the amount rs 678 was debited from my account and atlast it says your payment was failure. I was in a hurry and i rebooked the same seat by above procedure and my payment rs 678 was successful. Make my trip send a message saying my money will be refunded but not yet refund. When i contacted the customer care they are not responding properly for it. My total amount debited from my account is 1356 but my fare is 678.