Delhi Jal Board — non replacement of sewer line since 1963

Address:

New Delhi, Delhi, 110027

Sir i am a resident of j -12/39 rajouri garden, new delhi 110027. Since 1963 my father was in possession of the said property. Till date, the sewar line has not been replaced. Every alternate month i have to complain about it's blockage. The pipe appears to be old and small about 3 to 4 inches dia. I request to replace by a 10 inch dia to avoid any blockage/ reverse flow.
Regards
Satish chopra
J 12/39 rajouri garden
New delhi 110027