Delhi University — fee paid twice by mistake

Address: New Delhi, Delhi, 110085

Hello mam/sir

I am pursuing b.com from ncweb aditi mahavidhyalaya.
I paid my third year fee twice from different bank accounts because of some network issue. I paid rs. 3535 twice once from my father's account & once from my account on date 21/10/2018. The fee has not been refunded till now in any of these bank account.
Please refund my one fee of rs 3535.
I will be thankful to you.