Institute Of Banking Personnel Selection [Ibps] — Application Fee Payment Issue

On 9th Nov, I have paid Rs 850 for registering for IBPS PO exam.The amount was deducted from my account.But in IBPS site it was showing "transaction failed".I have raised complaint also.I was told to pay the fees again for registering and that the previous amount will be transferred back as the payment failed .
I paid again.But I didn't get the previous amount.It was already deducted from my account.Please refund me the amount Rs850