KDMC — Water bill

Hi Sir/Madam
My room is in shivaji colony. Nobody lives there since 2016 and there is no water/ electricity required. I paid water bill of rupees 7908.00 including 2508.00 as penalty and actual bill of rupees 5400.00 from 2019. I understand even though nobody lives there, i should be entitled to pay the minimum due. however, KDMC staff asked me to pay in full first.
Can i please request to get the calculation of why and how amount is charged on me as i also know if there are no uses of any subscribed item, the amount charged on that must be a minimum due amount.

Thanks