BWSSB — Sewage water from neighbour's building, leaking into our well and causing seepage in foundation of the building.

I live in 23, Central Street, Cleveland Town, Bengaluru-5
My neighbour's (House no.22/1) sewage line is blocked, chambers are damaged has been overflowing often. They have damaged chambers and pipeline, resulting in flow of sewage into our water tank and well. The owner of house has let out the building to several tenants. And is not bothered to address the issue. We have been arranging to clear the blocked drains from our end as we faced drinking water problem also. The neighbour is not willing to resolve the issue due to which sewage water stagnates in the ground and has found a way into our water well. This is a potential danger to my house which has load-bearing walls. Inspite of repeatedly asking them to attend to this problem and recommending agencies that can handle this problem, no action has been taken by them as yet. Please arrange to get the building surveyed by your officials and instruct my neighbour to attend to this problem to prevent further damage to the buildings and save the other residents from this health hazard.
Hoping to receive a speedy action from you, Sincerely.

K. Sharief