Bangalore Water Supply & Sewerage Board [Bwssb] — Meter issue

Address: No.32, 8th main, Dwaraka Nagar, Hosikerehalli, BSK 3rd stage, Bangalore-560085

Received bill for 27000 liters as on 15th Oct 2020. For 3 days 17th, 19th and 21st of October, meter reading shows 3680 liters. If I check with BWSSB, mentions that in a house 2 adults and 1 child requires 600 liters of water per day. So, the meter reading is correct. Need help.