• Less in carpet area not refunded as promised previously by builde

Hi, 
The complaint is against the builders, from which i have purchased the Flat.
The Summary is that the Carpet area of the apartment is not same as promised during buying. 
After continuous talks and disucssions for more than 5 months and measuring the place 5 times, they had agreed to pay the compensation, provided i get the Interior Wood work done from there own,interior desgins team. And they promised they will pay the less area compensation by adjusting in the Wood work bill.
Now after the Wood work is done, they are now saying that they will give certain amount and not the whole amount. They are suppose to pay me about 46,000 rs, but they are paying only 25,000 rs. 
Now after me telling that i will take necessary actions, he mentioned that he vil not pay even a paise now. It is my hard earned money and i want justice for the area they have given me.

So please suggest do i hold a valid case against the builders? and if yes, how do i proceed with the case.

Thanks and Regards,
Vineet L N