Delhi Jal Board — excessive water billing

Sir, my new kno is [protected] & received excess water bill without taking meter reading. Rs 2772/- dt. 19 feb 2018 7 rs. 2796 dt 17. Apr 2018. I & my wife both are in job, so there is less consumption of water previously i paid huge amount of water bill, recently my son with his family shifted so consuption of water is lesser quanity from jan 2018. How can i pay huge amount of water bill