Delhi Jal Board — contaminated (sewer water) supply

At kno [protected] contaminated (Sewar water) is being supplied from the last few days. We are regularly calling up delhi jal board people but no response. People are getting ill because of this water supply getting in our houses.in my family childrens are suffering from stomach infection and other diseases.
This is not the first time we are facing such problem, after every 15-20 days we have to face this.

Kindly take action on urgent basis.

Photo attached.