What course of action should I opt for

I have booked a flat in noida and date of completion of project was Dec 14. Now he has handed over for fit out. I made complete payment to builder. In complete block 5% flat only are given by builder for fit out. In the building nothing is as per agreement. Representative of builder says the builder can do this much beyond which is not possible. Initially the builder was Gardenia group. After some time the project was handed over to Futec shelter with whom the agreement was also done. Now the project has been given to Akshita construction for one to one completion. Now representative says the account of Futec shelter Pvt Ltd have been frozen and Akshita construction is doing it one to one basis. Work is not as per agreement. Light and water is there in flat rest nothing is there. Builder say they will charge maintenance @3000 per month. I have taken over for fit out and paid complete amount on July 19. In handing over for fit out letter I have written all pending issues. What are the repercussions since builder is not going to get OC from noida authorities since he did not pay dues to the authority as we think.