METRO BUILDER (ORISSA) PVT.LTD. - Builder not giving possession of flats

We have sold all our parental property & purchase a flat at Bhubaneswar. We have paid almost all dues of the builder. But unfortunately the builder is playing with us and not giving possession of our flat & demanding more undue amount. We booked the flat in October’** and the builder assured us to give possession by March’**** and accordingly agreement signed. But after * years from the committed date of possession was over and still we are not getting our flat. We are paying EMI since * years & also staying in rented house for which we are paying monthly rent of Rs.*****/- Our financial condition is too critical and just managing hand to mouth. After paying EMI and house rent we are not able to arrange bread and butter for our family. My husband has taken so many necessary steps for sort out the problem including approaching so many times to the builder. But all our efforts remain in vain. We have lodged complain to CM, DM, SP, Governor, Urban development ministry and ministry of law and justice etc. But no response from any sides. Finally he lodged grievance Petition at PMO vide No: DOURD/E/****/***** dtd. **.**.** and got response from your office. Based on the suggestion we filled complain at Odisha RERA through proper channel. After so many hearings for a period of one year, finally the RERA give order in our favor instructing the builder to pay interest for the delayed period and to give immediate possession. But the builder least bothered about the RERA order and not giving possession. Rather he is threatening to us in different manner. There is lot of irregularity in term of GST. Builder forcefully collecting GST @ **% against all payments we have made from **.**.**** and till date. He also not passing on Input Credits to us and never produced any receipts to us having deposited the amount to Govt. account. The book of accounts needs to be verified by the competent authority.