Complainants can file a class action suit if one builder cheats many buyers in one building project. Such class action suit can be filed before NCDRC if the value exceeds Rs. 1 crore. Thus, class action suit ensures redressal of grievances of all buyers whose rights have been affected collectively. You can still file a case under RERA if you wish to do so. Filing a case before NCDRC ensures speedy disposal of cases as well as a collective remedy.