Rajiv Gandhi Proudyogiki Vishwavidyalaya [RGPV] — Refund for my failed transaction

I have made the payment twice of exam form by mistake(7th-sem) of rupees 1850+1850 on 22/11/2021, This was done because of my first payment showed the failed transaction that is why i made the second transaction, but the amount deducted from my account is 3700/-(1850+1850) and i need the refund of my payment of 1-time(1850/-), as follows
I don't know the application transaction ID because of the failed transaction.
I have the evidence of both the transactions in my bank passbook.
so please lend me the refund of my payment (1850/-).

The transaction id for both transaction are as follows

Failed transaction -UPI/[protected]/14:33:33/UPI/registrarrgpvbhopal

Second transaction -
UPI/[protected]/14:59:47/UPI/registrarrgpvbhopal

I have mailed them on [protected]@rgtu.net 1 month before but they have still not returned my money i have sent them my account statement for the same payments too.Now they are just ignoring me and also not replying back to me.Plzz help me to get my money back to me