Lion Infra Manesar project has shocking hidden costs

My wife and I thought we had our budget sorted for a 3BHK near Manesar. But after talking to Lion Infra, the "all-in" price is way higher than quoted. They added PLC, parking, and some crazy "development charges" that weren't clear upfront. Is this normal? How much extra did you guys end up paying beyond the base price? Feels like they just spring these charges on you later. Any way to negotiate these down for a new project?