IDBI Bank Ltd — Double payment of loan processing fees

My brother has applied for housing loan to IDBI and since he was in US at the time of application, my father paid loan processing fees in advance to IDBI bank through a cheque on his account. Later bank came up with requirement that for a NRI case, they need cheque from NRE account only. Hence again my brother paid a cheque of processing fees to IDBI and asked for refund of the earlier payment.
SInce last 6 months we are following up with bank but there has been no replies to our mails from bank.
Also builder office is following up for the same.
Request you to help me in getting my money refunded and also teach bank a lesson as for each and every delay from consumer side, they have system of charging to them irrespective of the cause.