(C-19) Cancellation of Apartmnt-Underconstruction ,builder Delaying the refund after agreed 10% cut.

I Had booked an under construction apartment in Bangalore on march 21st 2020,Just before Covid lockdown began. I paid advance of 10L & Agreement was Signed between 2 parties; Cancellation Due to Loan not processing,In agreement it says only after they Find a new Buyer for the booked apartment they will refund with the 10% cut. Now for me the Loan was rejected from Bank & i have requested refun after cancellation ,The Builder is not refunding & delaying the Payment indefinitely. May 2020 i cancelled the booking, Still have got only 2 mail replies & no Phone calls answered by anyone. 1) Project was registered in RERA in 2018 till 2021 ,now Due to COVID extension They have got upto 2022 2) I lot my Job in May 2020. 3) They say they will rfund only after some one will Buy it. 4) Project currently is in a STATE Of 1st Floor SLAB (out of 3 Floors) i feel They have only completed less than 20% of the project. 5) RERA clause says they need to invest the 70% fund in RERA registered BANK or So , But Looks like they Have Moved teh FUND to Reliance MF (i was told by the manager of project ) 6) near the construction SITE , Relaince Housing Finance had Put a NOTICE of Payment due to Them of around 1 Crore from The project & no timely responce in it. 7) all the above makes me sure they delay will be more than 2+ years for the refund if i go by agreement , but due to covid & due to Construction not progressing for the RERA registered project above 20% as on today. what are my options to get the refund. Thank you in advance.