B. E. S. T. Undertaking — excess bill for march 20 to june 20

My consumer number is[protected].
The average bill for year 2019 from march 19 to july 19 was inr 1, 750/- per month which includes 4 people for 5 months. The sum of 5 month bill of march 19 to july 19 was inr 8, 750/-, you can verify from your records also. But after revising the slabs and recomputing the tariff based on actual consumption our adjustment bill for march 20 to july 20 is around inr 18, 750. The total amount for the period is inr 5, 330/- paid for march 19 to june 19 plus adjustment payable inr 18, 750/- which sums up to inr 24, 080. We are a middle class family and we have all had pay cuts in our salary and in this situation we are shocked to see such a big consumption in our name.
Our consumption units were 1679 for march 19 to july 19 period, again you can check the records. Our consumption as per your adjusted reading shows consumption units as 2681 for period march 20 to july 20.
We request you to look into the matter.