Delhi Development Authority [DDA] — about unauthorized construction

Address: Unit no. 121, UGF, Garg Plaza, Plot No. 24, DDA Community Centre, Road No. 44, Pitampura, Delhi-110085., New Delhi, Delhi, 110085

In DDA Community Centre, Road no. 44, Garg Plaza, Plot no. 25, 2nd Floor, Pitampura, Delhi-110085. In this premises, they have broken the supportive pillers of the floor & cover the gallary part to make a hall. Construction is running past 5 days & they throwing heavy Debris in front of other's shutter/door. Due to this very much dust are blowing.
We have told them many time. In the first day they hit the floor breakage with heavy hammer.