Vatika mindscapes complained

I ,Age-69years (Senior citizen), had bought a unit inVatika Mindscapes from Vatika Limited. Details of the properties mentioned Project Name Vatika Mindscapes Booking Date 29-Jan-2014 Allotment Date 30-Apr-2014 Payment Plan Opted DP (Down Payment) Area 500.00 Sq. Ft. Currency INR The builder Vatika (Mindscapes) had promised in the allotment letter that the commercial space will be completed and ready to lease by 31/12/2015 and accordingly I will receive rentals @Rs 65 per sq.ft. for 500 sq.ft w.e.f. 31st Dec,2015.In the event the premises is leased any time after 31st Dec,2015, the developer (Vatika) shall be paying the rentals as per clause (61.1) The developer will pay at the rate of Rs 65 per sq. ft. super area of the said unit per month as committed returns for upto three years from the date of completion of construction of the said Building or the said Unit is put on Lease and lease deed is executed in respect thereof, which ever is earlier. The commercial space was supposed to be completed by 31 st Dec, 2015 , as per the Builder buyer agreement , but till today the project has not been completed. It has been over delayed by three plus years. I'm a retired person and wanted a monthly income and relied heavily on this project and invested majority of my savings into it. Please advice what can I do now ([deleted])