Delhi Jal Board — Abnormally high water bill of 13000 for 3 months

Address:

New Delhi, Delhi, 110009

Sir/madam i was handed a water bill of rs 13500 for a duration of 3 months.
According to the bill we had consumed 200 units in last 18 months, and then we have consumed 400 uniits in last three months only, which is just impossible.
Please help us on this matter, as we are only students and cannot pay such a huge amount.
Please sir consider this issue as soon as possible.