We booked a flat in a well-known Gurgaon builder’s project and paid 18 lakhs as a booking amount. Now, due to unforeseen financial difficulties, we can’t afford the next installment. The builder refuses to cancel our booking, even though we’re willing to pay a penalty. They’re holding onto our 18 lakhs and won’t provide a copy of the agreement we signed. What legal options do we have to get our money back and avoid losing the entire booking amount?