Guru Gobind Singh Indraprastha University — payment deducted from bank but receipt not generated

I had to pay my Counselling Participation fee for BJMC(126) on 14/08/2018, so I selected the PNB Net Banking option for paying the amount. The Transaction was successfully processed and the amount of Rs.1011.80 was deducted from my Account but the receipt was not generated and the money was shown not received by the university. Hence, i had to pay using the debit card option again due to last date of paying the counselling participation fee.
I tried calling on these numbers [protected] and [protected] but no one picked up the phone and gave a reply. I also tried sending an email to [protected]@gmail.com but no reply was received till now.
It's been 4 days an still the amount paid through net banking has not been refunded.
Please Help.
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Details:
Applicant name: Rinky Kaur Bawa
Roll No: 1262903
Course: BJMC
Amount Deducted: 1011.80
Date of Transaction: 14/06/2018
Bank's Name: PNB (amount deducted from this account)
Payment Option: Net Banking ( PNB Retail)
Bank Holder's Name: Ramneek Bawa ( Mother)