Super area claims are pure daylight robbery in Bengaluru

Does anyone else feel super area is a total scam after possession? I just moved into my 2BHK at Reliaable Lifestyle Layout from Devi Shri Properties. They quoted 1200 sqft, but carpet area feels barely 850-900. Matlab, paying so much extra for common spaces. Is this normal for Bengaluru projects or did I get a raw deal?