non delivery of flat even after 6 years of booking it

&lt;p&gt;&lt;b&gt;Location/place&lt;/b&gt;: agra&lt;/p&gt;<p><b>Name of company/service</b>: parsvnath developers</p>I had booked a flat in parsvnath prerna at fatehabad road agra in Jan 2007. As per flat buyers agreement I was supposed to get the possession of said flat in 2 years. Now it’s almost 6 and half years and my flat is still incomplete. Whenever I ask them for delivery time, they say it will take 1 year. Suggest me what to do?