Kerala Water Authority — inability to make advance payment

Address: 695025

My wife and i are living in this flat on rental basis. We travel to saudi frequently. I would like to therefore make additional payments to the bill, so as to cover the next one or two bills in advance. This is because i do forget at times, and don't want to create problems for myself.
There is no provision in your system, giving me the option to pay more than the bill amount.
This needs to be looked into and suitable options made available to a customer.
Colonel l padmanabhan