Want to get refund on property investment

Dear sir, I am nri, invested with a builder in Bangalore for pre launch project 3.5 BHK in January 2016. I paid 95% of total amount as they gave less price also I took personal loan from city bank to pay the amount. Expected delivery was December 2017 after grace period it was maximum has to deliver by June 2018. But the builder unable to deliver the project. They keep on giving so many excuses, they say master plan has to be ready and rera approval is pending. I heard from their many customers that all their projects are delayed also they are unable to refund the money as already their money is stuck in ongoing projects in other India states. I have got agreement paper with invoices from them. I paid 50000 rs. Service fees in local currency. Rest amount was paid from my nri account. I would like to know if I put the case against them how long this case can go for settlement. Do I need to come Bangalore to resolve the issue? Please WhatsApp me any info at [deleted]. Also I would like to know If I go through kanoon.com what will be total payment I need to pay? Appreciate your kind help in this regard. Thanks Pintu