Noida pre-launch schemes are a total scam

Not proud of this but I almost got duped by a pre-launch scheme for a 3BHK in Noida's Sector 137. Gaursons ka project tha. They showed a great price, but the construction-linked payment plan wasn't clear. Bola 78L for 3BHK but with PLC and IFMS, it quickly hit 90L+. Had to pull out. Anyone else face such a builder payment trap? What did you do?