Goibibo.com — Request you to refund my full amount

Address:

Pune, Maharashtra

I have booked a refundable 2 night hotel stay at Mahabaleshwar at Ramsukh Hotel for the 20th and 21st of March 2015 on Goibibo.com website on the 9th of March 2015. The booking confirmation states that the Hotel booking can be cancelled before[protected]:59:00 IST, Cancellation charges will be 0% Cost.
Although I want to cancel the booking, they are stating that I will not be able to get full refund as I have used their coupon code FULL REFUND.
I have paid Rs.14, 758 using my HDFC Credit Card for this booking HTLV26K48H for which I would like to get full refund, but Goibibo.com is stating that because I have used their coupon I can only get partial refund of Rs.4, 758 back to my credit card.
This is clearly not correct as the booking confirmation states the Cancellation charge will be 0% cost.
I kindly request you to refund my full amount of Rs.14, 758 at the earliest.