Hyderabad builders' hidden charges: is it negotiable?

Builder's 'final price' is never final in Hyderabad, it's a total scam. I bought a 3BHK in Begumpet from Salarpuria Sattva two years back, thinking I'd locked in a good deal. But the 'hidden charges' just keep popping up. Matlab, PLC toh samajh aata hai, but then there's floor rise, maintenance advance for 2 years, club membership, and even car parking extra, all adding up. My actual all-in cost shot up by almost 12% over the quoted ₹1.8 Cr. This seriously impacts my ROI calculations and total acquisition cost. Doesn't anyone else find this practice frustrating? How do you guys factor these into your initial budget? Or is there a way to negotiate these down later, ya they're non-negotiable?