Supertech — supertech is not paying pre-emi under subvention scheme

Address: Supertech Upcountry - Sector 17A, Gautam Buddh Nagar, Uttar Pradesh, 201303

I booked my flat in c4-upcountry in dec-2014 under subvention scheme. I was promised that you will get possession by march-2015. However its been more than 5 years i did not get possession. There is no any assurance from them who can tell us the exact status of the project. No customer support system, no web site, no email response nothing from their end.
Past 8 months they stopped paying pre-emi amounts also they stopped responding to my emails, phones, text messages etc. So many times i called them but no any response from them.