School Of Open Learning — Refund for double payment

I have taken addmission at ba programme and made payment to du sol by online mode
but by mistake made payment 2 times
i want a refund for 1 extra payment
i have waited for more than 1 month in thinking du sol will refund back but nothing happened
i have contacted by bank and they have also said the payment was succesfull. Contact du sol for refund
i am providing details to you
date of transaction:[protected]same for both transactions)
bank refrence id:
1. Prcr/[protected]
2. Prcr/[protected]
trasaction amount: 4040 (same for both transactions)
bank name: south indian bank
sol roll no.[protected]
i am attaching my bank statement below

please help me in taking my money back