Billdesk — I paid my admission fee but did not get any confirmation receipt with transaction id

Address:

A, Kolkata, West Bengal, 700084

Today morning while paying an admission fee towards Dinabandhu Andrews College, Kolkata. I completed the payment as I have received a confirmation message from my bank and the receipt displayed to me on my screen was blank with no transaction reference number written on it. Kindly let me know how can I regenerate the payment receipt provided that I have no transaction reference number. The payment was done on 12th of June 2019 at 10:36 am.