Supertech — Unauthorised money with the builder , neither project started nor refund nor relocation

Address: 1346, Sector 12 , R K Puram

I had booked a villa in their supertech sports villa in 2015 Villa no B-33, to be delivered in March 2018, they stopped the project and did not inform anything even once.
After that they offered a shift to their Supertech SuperNova project, which I accepted unwillingly as they were neither ready to refund and never bothered to response to me, I have a chain of around 60 mails not responded by anyone.
They have no respect for any customer at all, its been 9 months since they offered me shift, took additional 10 lakhs on top of 60 lakhs I paid earlier for the Villa and they have not shifted me to new project either and they don't respond either.
When I have asked them to refund the new booking amount they said they neither refund nor relocate nor do ANYTHING and they don't mind me going to court ..apart from issue with them sitting on my hard earned money I see them as a harassment and extortion team. Please suggest what should I do now .