Delhi Jal Board — Non-refund of overpaid bills of djb

Address:

New Delhi, Delhi, 110009

During february 2016 a bill of rs.12508.54 was sent to me for payment of water bill to pay to avoid disconnection.
I paid rs.12509/- in november 2015 but eventually an amount of rs. 2808.62 have been adjusted (Details of which have not been given to me) and balance of rs.9700/- is lying with djb. On my repeated requests for refund of this huge amount, they have not taken any action.
Through this forum i once again request djb to refund me rs.9700/- immediately.