Delay compensation for a RERA Registered Project

I invested in a property in Pune in August 2018. The project had begun in pre RERA days and had promised some of it's existing buyers completion date of Dec 2016 which it clearly didn't meet. At that time when my agreement was executed ,project was registered with MahaRERA and had a completion date of 31 December 2018. My agreement has a completion date of December 2018 too. They have failed to deliver the flats till now (September 2019) with a lot of construction still to be done. In December 2018 they applied for 1 year extension in RERA and got completion date extended to Dec 2019. Their RERA application currently shows this: Project Status On-Going Project Proposed Date of Completion 31/12/2016 Revised Proposed Date of Completion 31/12/2018 Extended Date of Completion 31/12/2019 I have following queries: 1. What are my chances to seek damages from builder as he has denied any for Dec 2018 - Dec 2019 saying that the RERA extension overrides all previous agreements. Who should I approach RERA or some other court. 2. What are my options to seek damages for the delay and for what period can I seek it, post December 2018 or post December 2019? My agreement and RERA at that time had December 2018 as completion date, but now it is December 2019. 3. The project is most likely not going to complete by December 2019 (3 months from now) and since RERA has a huge waitlist to process complaints, what should be my ideal time to file a complaint? I want to ensure I get a ruling even if it's for post Dec 2019 in case RERA rule in favour of builder paying no damages for the 1 year extension from Dec 2018 to Dec 2019. Should I delay it to ensure atleast I get a ruling for the Dec 2019 deadline or builder can seek more such extension?