Bangalore Water Supply & Sewerage Board [Bwssb] — increasing bill

The consumption litres shows 89000 litres in bill. Which is never possible.
The capacity of our tank is only 5000 liters
Water comes only twice a week
So i cannot have water of more than 40000 to 50000 litres.
How come bill is showing 89000 litres

We are common man. We cannot pay this much bill of 4000 each month.. Why don't you take some measures