DLF — Water seepage from the roof of the building into the 20th floor apartments

ROYALTON TOWER at Princeton Estage, DLF Phase -5, Gurugram Haryana is a 14 years old building, having premium apartments and was constructed and sold by DLF Ltd in 2008.
We, the residents have been facing lot of construction related issues in the building and the major being the seepage of water into the 20th Floor Apartments, which is basically due to the substandard water proofing done by the DLF Ltd.
We would like DLF to depute a team to take the necessary corrective measures, access the damage to the building and the risk to the life of the residents and repair the same at the earliest.