Emaar Mgf Land — flat in cwg village

Address:	New Delhi, Delhi, 110093
Website:	EMAAR MGF Limited

I have purchased a flat in cwg village at akshardham delhi from a seller. I have entire amount to him and he paid his entire balance to emaar mgf ltd two months back. After getting clearance i also borrowd a loan of rs.2.00 crore from bank as well.
On their website they have transferred the unit but not providing any documents, not doing registry not giving possession and not giving any reply as well. I have sent a legal notice to them as well. Bank has also written a letter to them but surprisingly they are not even bothering about all this and giving any reply.
I have no choice except to lodge an fir and file a court case against them but it will itself increase my mental harrasment.
What should i do. I am paying interest of 2.00 crore every month and not even having the property.
Should i approcah to rera or what.
Please help.