In my opinion, the best way to pay any type of bill is through Airtel money.
You can register with Airtel money by dialling *400# from your Airtel cellphone. Enter your details and get a valid account.
After that, recharge your Airtel money account either online or from any Airtel recharge point and enjoy the service. You can pay any bill using this account. You can also book railway tickets, bus tickets, air tickets, recharge any mobile network, dish TV and much more.