ICICI Bank — I have made a payment but the recipient has not received it

With all due respect I have made a payment of ₹510 to Delhi University through eazypay payment gateway for my examination form but the university officials claim that they have not recieved any such amount, please look into this matter and do the needful
My reference ID at eazypay - [protected]

Also after payment the redirecting page showed error which might have resulted in payment failure however my account stands debited with ₹510.Please look forward to refund my amount