My Dwarka flat's 'all-in' cost isn't adding up

Been looking at flats in Dwarka for almost a year now, and finally liked a project by Property Gallery. Initial talks mein sab kuch sahi laga, budget bhi theek tha. But ab jab final cost nikaal rahe hain, it's like a whole new calculation. Yaar, hidden charges itne hain ki mera pura budget hil gaya hai. They're asking for PLC, then separate parking charges, fir two years' advance maintenance, and even a mandatory club membership fee jo pehle kabhi discuss nahi hui. Matlab, ye sab toh initial quote mein tha hi nahi! It feels like they just keep adding stuff. My parents keep saying aise hi hota hai Delhi mein, but I had no idea it'd be this much. Ab samajh nahi aa raha, is it normal? Is there any way to negotiate these 'surprise' costs? How do investors factor this into the total acquisition cost or ROI calculation?