Noida stamp duty estimates are a total lie.

Just got my flat in Sector 150 from Godrej, possession was last month. Abhi pata chala ki stamp duty and registration charges are way higher than I estimated. Builder ne bola tha 'approx 7%'. But with all the extra fees, it went above 8%. Aur spot discount bhi mila tha, but woh bhi adjust ho gaya kahin na kahin. Has anyone else faced this? What's the real all-in cost for a 3BHK around ₹1.5 Cr in Noida?