All India Institute Of Medical Science [AIIMS] — payment tempered 2 times, money deducted transaction failed

I am drpayal. I filled up the aiims mds form for january 2018 session on 13th september 2017. During payment first two time amount of rs1000.5 was deducted thats total 2005rs from my bank account.
I have confirmed it from the respective bank that the transaction was successful and aiims has to refund it.
I have mailed and called the helpline numbers [protected], [protected] unpeempth time but no luck. The following reply i get everytime i mail which is of no use.

Dear candidate
As per payment procedure, aiims cannot receive more than single payment against each registration. It is unlikely that the payment will be credited to the aiims account more than once for every registration.in the event of multiple payments debited from your account it is likely that the payment would not be credited to the aiims account & will be returned by the bank to you from where your payment is made. Therefore, you will have to check with your bank regarding the status of payment deducted in excess. However, due to any reason, if any excess payment is credited to aiims account, this will be verified and refunded in most cases within a week. If a complaint is received regarding refunds of payment received in excess in aiims account, aiims shall take up all such cases with the bank and refunds will be made within 15 days from the last date of registration.

According to the above reply from aiims the money should be refunded within 18th of october 2017 as 3rd october was the last date of form fill up but no refund has been initiated. And the helpline numbers give a busy tone and when it rings no one picks up the call.
This type of negligience is not expected from such a reputed institution.
Kindly do the needful as soon as possible
Please help me