Bangalore Water Supply & Sewerage Board [Bwssb] — Sewage line - blocked by neighbour[protected]

Address: 28 thambuchetty road cox town

Dear sir, I'm Dr Vikram[protected]
Im residing at no 28 Thambuchetty road coxtown bangalore.
My grand father bought this site in 1961 since then sewage line passes thorouh no 27 house and reaches the conservency line behind. as per aggreement at the time.
We built a new house now but no 27 owner has blocked the sewage pipe to our side with concrete.
As per BWSSB there is no other sewage line available