Imperia Structures Ltd — Builders stopped committed return on investment

Address:

Uttar Pradesh

Imperia Structure director's the Batra's refused to pay the committed return @ 12.5 p.a. from a April 2012 onward to all investor on their investment in Imperia Residency at Greater Noida K P V which they have to pay every monthe as per written M.O.U. till the occupation of entire building..They have told to us that we should accept their offer in Toto which is as follows;-
"The investor should accept thee return up to 30the Sept 2012 and forget the further return thereafter and clear their balance dues and take the possession of the unfinished Studio apartment without obtaining the completion certificate as well as occupation certificate from Greater Noida Autheority(which is the builders responsibility as per norms).They also saying that they can not do more than this."
we all investors are being cheated by builder in this way.
Pl advice what to do next.