Delhi Jal Board — blocked sewers and complaint not attended

Address:

197 parmanand colony, Delhi 110009, New Delhi, Delhi, 110009

Sewers of service lane behind house no 197 (My house) are blocked every week and complaints are attended very late after 2-3 days. Water back flows into our toilet making it difficult to use.
The staff who has to attend complaint attends to the complaints of those houses who pay them money as bribe and other complaints are attended very late.
I do not know whom to contact for acgtion.