BWSSB — Hardly any water supply

BWSSB - Basic Facilities
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We stay at Kagadasapura First Cross, CV Raman Nagar, Bangalore 93.
Water supply is available only once in a weeks or 10 days.
This forces all to buy water from tankers.
When BWSSB is not able to provide water for its existing consumers, they are expanding it with Phase4/5 etc to new areas.
Would like to know what are the ways to officially register the complaint, is there any obligation/law which says that BWSSB must provide some minimum amount of water in a month.
After paying a hefty sum to BWSSB it is very disappointing that we do not get enough water to meet even 10% of our requirement.