i have not got a confirmation from my electricitywatergas board when i pay on their website i get an instant confirmationwhy is it so

Utility Bill Payments
I have not got a confirmation from my electricity/water/gas board. When I pay on their website I get an instant confirmation.Why is it so?

Even in Paytm you would get instant confirmation of your payment. In very small number of cases the operator may take upto 24 hours to send the confirmation message. This does not mean that the transaction is unsuccessful. We request you to wait for 24 hours and this should be resolved automatically. Please contact the Paytm customer care with your order Id if you haven’t received any confirmation even after 24 hours.