Delhi Jal Board — excess water bill for current period

Sir I have received bill for Rs3390.This is highest in last 40 years .We are two old people living here .My age is 70 and that of my mother is 93.Sir can we consume water as mentioned in the bill ? There are no arrears as we pay regularly .My KNO is[protected].Kindly look in to the matter and oblige .As directed we will pay the bill in a day or two .But please look in to the matter and adjust the excess amount in future bill .Sir if you take even average of last one year of paid bills then it will be around Rs1000 .So certainly there is error .