Flat Owner — complain about a tenant harrasment

Address:

c/42 shree om villa, shahibaug, ahmedabad., Ahmedabad, Gujarat

We live in a flat where the water tank supplies the water for 4 person per family.. But one of the flat owner rented his flat to a tenant where there are more than 10 members living.. And we are totally disturbed by the water supplies.. The secretary of flat has issued a notice on a letter pad of the flat.. But the owner of flat is not taking any action.