Bangalore Water Supply & Sewerage Board [Bwssb] — Kaveri water mixed up with drainage

Hello,
This is Sreevidhya. From 3A Cross Saptagiri Layout 2nd main somanna garden Vidyaranyapura Bengaluru 560097.

It has become a major unresolved issue on our line every 2 days a week. Water is mixed up with drainage waste & even the colour is changed. Complaint filed locally, inspection is also made by the concerned b we see no results. The expense incurred on cleaning the water storages & buying the commercial tank water can't be continued for long. Problem persisting since 2 weeks now. Plz decide upon resolving the problem of respected citizens immediately. (If not resolved ASAP, legal action is intended to be taken by the residents.
Thank you