Pilkhuwa flat delivery: super area ka sach

Super area figures in Ghaziabad are a total joke, honestly. Just moved into my Capital Propmart flat in Pilkhuwa and the actual usable space is way less than what was promised. Brochure mein kuch aur tha, carpet area kuch aur nikla. Is this normal? Builder ne toh bas 'industry standard' bol diya. What can one do?