Refund from Builder

Dear Sirs, In pre-launch stage I had booked a 2 BHK flat in Pune (MH) in 2016. Total building is designed for 11 floor. Total cost of my 2BHK flat is 55.50 L. As initial payment I paid to builder 6 Lakhs ( 1 Lakhs by cheque & 5 Lakhs by cash). Accordingly builder given me payment receipts against cheque & cash. Due to unavoidable incident, I have cancelled my booking. While cancelling builder ask me for original receipts and I have submitted to him (which is my big mistake). Now, I have Xerox copies of all original receipts with stamp on it. Also, while cancelling builder asked Cancellation letter from my side which i have submitted to him (Letter contains details regarding Flat No, Cancel-date & Amount which he needs to return to me on plain white paper). While cancellation he agreed to provide me post-dated cheques. However, still we are waiting for that. Every time while making follow-up's, he was telling me that with in short period he will give me cheque. Now, its about to complete 1 Year, still we have not received single penny from him. So please tell me, Can I take the legal way of getting the money back (As I have submitted my original receipts to builder)? What are the chances that I will get my money back?