Want to cancel apartment 2 years delayed, without penalty

Hi All, I have booked apartment back in Aug/2013 in Greater Noida, which was supposed to be completed on Feb/2017. I got possession letter on May/2019, but when I visited apartment was incomplete with lots of damages. I have already paid 95% of the total cost of the apartment. Meanwhile I started asking them for total refund, but they ignored initially. Later they contacted and said I will have to pay 10% fine for cancellation, and also my rest of the amount will be given back only once apartment will get resell. Apartment is still not completed. I filed RERA Conciliation case, asking for apartment booking cancellation. Last week had first hearing where RERA representative suggested me not to go for cancellation as builder got OC/CC of the tower where my apartment located, so my case is week now, and also builder will deduct fine amount. In hearing builder rep said, they will hand over apartment in 3 months provided I pay for rest of the dues including registry amount. RERA representative asked builder to share breakup of amount I need to pay within week, and will discuss rest in next hearing. Anyhow its already 10 days and still no update from builder. I want to cancel my booking. How should I proceed?