Rajiv Gandhi Proudyogiki Vishwavidyalaya [RGPV] — Refund of excess amount of exam fee

Date of Transaction- 05/03/2021,
Transaction Id 1- T2103052229463196623763 - 1850/-
Transaction Id 2 - T2103052234257140755682 1850/-,
Amount of Transaction- 1850, and 1850
Bank Name- State bank of India,
I have paid for 2 times on 05/03/2021. didn't got refunded also form not get submitted to rgpv, its happen twice.
and on 08/05/2021 when I paid the exam fee for the 3rd time that was successful on rgpv site
I have mail all the details to [protected]@rgtu.net many times but nothing happened till now.
So i want get refund of rs 3700 / as soon as possible