Legal advice on property oc

Respected All, Kindly guide us in the following matter: we have purschased a 2 BHK Flat in Bengaluru in 2017, while purchasing the builder had promised to give OC in 2 weeks of time. But now itss 2 years there is no sign of OC. Whenever we have meeting (once in 2 months) everytime he assures that we will get OC is short time. But now we have understood that we will not get OC as there is deviation in the building and when we residents told him that we will take him to court he confidently gives the judgement saying, your case will not stand in court as whatever documents is required in court i will submit and see that the case only gets postponed and never gets solved. Now we are in fix , our 52L has gone as dead investment as without OC the property has no value. Kindly guide me, whether i can take the case to consumer court saying the builder has been harassing us since 2 yrs ? Let us know how to we handle this legally???