Consumer Redressal

We booked the flat on 19 december 2009 with armstrong builder. They issue the letter of intent on 10 april 2011. They promise to give us possesion with in three years .they also told us that as soon as the plith level complete we should pay 5% of the payment. But from that day they only complete the plinth level. And whenever we askedabouth the worrk every time they give us false commitment.I have my all my payment recipt with me. We already paid 36000+148635 on 12 may 2010 and 25 april 2011 respectively. Last time when i talked in the office they told us that the work will start in the month of august 2014.On 20 june 2014 i dial the phone number 02230218899. On this number we had a conversation several time with them.But since last two three days we cannot able to connect with them . Sir please help me regarding above matter as soon as possible.I will highly obliged if you take the need full action.