Real Estate company not refunding my money

Dear Sir, I had booked 4 kattha land in Metro City Project under Janapriyo Real Estate on Feb 2015 with the 60 % of total amount of the land in the first 6 months, rest of the money I had cleared by June 2017 and as per the Agreement the said land was supposed to be handed over by Feb 2018. On Feb 2018 when I went to see my plot I was shocked that the 1st Phase was not completed and there was no sign of 2nd Phase where my plot supposed to be. I went to the Builder Office and enquire about the issue, there were big argument and the conclusion was to refund my money. After several follow up the company paid 2lack 50 thousand in 5 months after the notice given to the company. and now refusing to pay they are telling that once your plot re sold then they will give the money. Kindly advice what I can do now even I had sent the final notice through mail and registered post mentioning that I will take strong legal action, they didn't reply anything and even not answering my calls. Appreciate your suggestion as I am an NRI.