Smartworld Developers: Anyone else faced hidden charges at possession?

Finally got possession of my 3BHK in DLF City Phase 4 from Smartworld Developers just last month, but the final cost has me fuming. The amount for 'other charges' bilkul unexpected tha. Maintenance advance for two years, IFMS, and then a mandatory club membership fee that was never clearly disclosed during booking. Brochure mein toh bas unit price dikhaya tha, koi clarity nahi thi. My original budget was around ₹2.2 Cr, but ab toh ₹2.4 Cr cross kar gaya. Is this common with new projects in Gurgaon? How do builders get away with hiding these costs until the very end? Koi tareeka hai isko challenge karne ka ya sabko chup chaap pay karna padta hai? Seriously, not sure if I should pay or fight. What did you guys do?