Dispute with builder

Hi, I have purchased an under construction property in maharashtra in 2014, before MhaRERA came into picture. Back then as everybody knows that builders used to have agreement in their favour only. If i am not wrong then agreement used to be 90% in builder favour. In my scenario, agreement was created like if i delay payment then i'll be charged 20-24% and in case builder delays possession, he will be chaeged 1500 rs per year. So, suppose if my agreement date is about to expire, and there is no chance that builder gives possession in next 18 months also. Can anybody suggest please what Rera says in that regard? I had read mharera clause 18.3 which i feel states compensation will be as per rera. If builder gives late possession. Can anybody please revert, what are my rights as per rera and what compensation i'll be eligible for? And when previous builder realized that he'll be unable to give possession in 5 years then he transferred his rights and new company took over and now says its 100% share purchased by new company. Its not company transfer! MhaRERA clause 15 clearly states, for any company transfer 2/3 allotee consent required. Which new builder says not required as they have purchased 100% share and will share company incorporation certificate. Please asses this situation and suggest, more suggestion that i am unable to think and suggested in this forum are also welcomed. Request to revert ASAP, and thanks in advance. Thanks,