All India Institute Of Medical Science [AIIMS] — aiims excess amount not refunded

Sir
My name is swati m.
On 22nd feb 2018 i made two payments against a single mbbs registration for the year 2018.
The first transaction was failed. So i made another payment from another portal and another gateway and with a different account that is using another debit card.
The second transaction was successful n registration was completed. I request you to kindly refund my rs 1500/- as early as possible. My registration no is u[protected]