Legal action against Builder for not giving maintenance handover

Hi, We live in a plotted society that was developed majorly by one builder and now the remaining plots are being sold individually to buyers. We have received temporary OC as some infrastructure facilities are still pending. CC is still pending. The builder has allocated a sister company to do maintenance of society. The quality of maintenance is really poor and CAM charges are really high. But all buyers are bound by a maintenance agreement that mandates payment to the agency. There is no exit/term clause to the agreement. Only exit is when the RWA/Local govt agencies takes handover. Due to this reason most residents want RWA to take handover and get rid of maintenance agency. Our existing RWA is registered but have failed to take handover from the agency. They claim that agency is not giving handover or IFMS amount. What can residents do in this case? Can I sue the agency for not giving handover to RWA despite them wanting it. I am unable to get any document/evidence from RWA supporting their claim of asking handover, except one email. Can that work? Also, I have recently realised that many RWA members were not paying CAM charges themselves. Would that not hamper handover chances? What should be the next steps.