Consumer Redressal

I have purchased a Flat at Akshara Pearl, 200 N S Road, Narendrapur, kolkata from the company \' Siddhartha Real Estate Private Limited (Kolkata) in 2010 and got the possession in 2011 in november. I registered the flat in another 2-3 months. The Roof of my floor has got a crack, which i addressed to promoter and he admitted that there is a crack but ceiling will not fall down in any events/occurence and he fille d the crack with cement on the roof. But still i can see the cracks apperaing on the roof. There are cracks on walls as well. i have asked them to repair the roof and give me long lasting solution which i am not getting. i would like them to compensate and take necessary action for the safety of the family members staying in the flat or made me available any other flats. This is a new complex and in any case there should not be any defificeny of construction should come. Please help me how can i bring the company to court and get my money back.