I invested in Project Dwarka in 2014.Started payin...

I invested in Project Dwarka in 2014.Started paying EMI's since June 2014 and till date (NEARLY 6 YEARS) after 90% disbursement, this pathetic builder is not ready with the flat for possession. These guys have also crossed RERA registered possession date. Any way I can take them to court? Any help and suggestionssuggestiopns