Mohali builders ki hidden charges ka kya karein?

Hidden charges in Mohali property deals are seriously out of control, it's so frustrating. We're downsizing, kids have moved out, so selling our big place to get a manageable 2BHK in Sector 70, maybe from Next Generation Projects Pvt Ltd. But yaar, jo initial quote dete hain, woh final nahi hota. Stamp duty, registration, parking, PLC, then OC charges, IFMS... matlab kitna aur add karenge? They don't tell you upfront about these extra costs that appear near possession. Our budget for a 2BHK was around ₹1.2 Cr, but with all these extras, it's shooting up. How can one plan for the true all-in cost? Did anyone face this with their Mohali flat? How much extra did you end up paying for all these 'other charges' at possession? Any way to negotiate these down with builders?