Bangalore Water Supply & Sewerage Board [Bwssb] — Need to convert from non domestic to domestic

Address: Krpuram

I was asked 12000 just to convert from non domestic to domestic.. the area was just 300sqft and had only 1 floor.. they were like the hosue is now 2 floors including terrace u need to pay 12000 … how can they ask us to pay so much without explaining how it can so much for a very little place… two hundred times they call in a day to get the payment done so that all the process happens in 1 day..