What are terms of your agreement regarding refund ?
2) if builder failed to register agreement within period of 21 days you should have issued legalnotice to builder to register agreement in your favour
3) if he fails to do so inspite of repeated reminders you can cancel the contract and seek refund
4) per The Real Estate (Regulation and Development) Act, 2016, which came into force on May 1, 2017, The allottee have the right to cancel/withdraw his allotment in the project . Provided that where the allottee proposes to cancel/withdraw from the project without any fault of the promoter, the promoter herein is entitled to forfeit 10% of booking amount for the allotment. The balance amount of money paid by the allottee shall be returned by the promoter to the allottee within 45 days of such cancellation