Keep proof of all contracts, payment receipts with GST/TAX, always pay using bank transaction to company account and don’t pay by cash or UPI this may cause cheating from the builder.
Consult a lawyer who specializes in fraud or construction law. They can guide you on the legal options available, including filing a lawsuit or taking other legal action if any wrong happen.
Is is safe and appropriate, confront the builder with your concerns. Ensure you document all conversation with pricing and time line.
Pay only after 100% completion of entire building don’t consider only your flat work otherwise immediately halt any further payments to the builder until the issue is resolved.
Verify whether the builder has a history of such behavior, consider by reading the reviews and online.
Taking these steps can help you protect your financial interests and potentially recover any lost money.