Godrej aur ATS ke hidden charges ka game in Greater Noida

Godrej aur ATS ke projects mein hidden charges ka game bilkul samajh nahi aa raha. I work in real estate, but when I'm buying my own 3BHK in Sector 150, it's a different ballgame. They quote around ₹1.2 Cr, but then registry ke time pe PLC, IDC, maintenance deposits, sab mila ke ₹10-15 lakh extra maangte hain. Yeh toh seedha-saadha loot hai yaar. Aur construction quality? Suna hai ATS ke kuch projects mein seepage issues aa rahe hain. Godrej generally better hai, but unki customer support after booking... phone hi nahi uthate sometimes. Gaursons ka kya scene hai? Anyone faced this with these builders, especially in Greater Noida West or Yamuna Expressway projects? How do you negotiate these 'extra' costs? Yeh sab pehle kyon nahi batate?