NRI buying in Noida — hidden costs are killing me!

Okay I'll be honest — I completely underestimated the hidden charges. I'm based in Dubai, can't easily visit. Booked a flat with Builder X in Sector Y. They promised one price, but now PLC and EDC charges are insane! Matlab, almost 10% extra! Is this normal? Anyone else faced this with Builder X? Or Builder Z? Should I fight this or just pay up? Need advice from people who know Noida property scene.