ICICI Bank — amount debited but fee not paid - on easy pay

While making a payment of rs. 4510.00 for teacher registration at http://dled.nios.ac.in/, i opted net banking payment from my hdfc on icici eazypay, however, while my account was debited. I checked my account and it was debited for rs. 4510 immediately. I contacted hdfc, they said to contact merchant side.
As it was last day for payment, i tried again and that time payment success for nios.ac.in
Amount:4510
Failed transaction number: [protected]-citruseazypay
Check ref number:[protected]
Attached both payment fail and success screenshots. Attached the transactions also.

Hdfc side confirmed that it was merchant only responsible for this.
Please check they confirm that from merchant side only needs to get the amount.
Please help me out to settle this issue.