Ibibo — refund of amount not yet done

I paid an amount of rs.5500 for my admission to hyderabad central university. But when i paid the first time i didn't get any acknowledgement and the said amount got debited. So i paid again thinking the transaction must have been incomplete and the amount will be refunded. And i paid again and this time i got an acknowledgement in the form of sms to my phone. Please address my problem and refund the amount which was supposed to be refunded.

Ibibo otc no:[protected]
Cn[protected]