Builder Harrasment

We purchased our flat in June last year. The builder took advance amount of One Lac fifty thousand Rupees regarding Club house however the club house is still not completed. OC/CC not given yet. All the flats have common leakage problem. Drainage system is unseen. Builder had promised of 24 hours water supply but a few months ago we realised he was stealing water from another complex's pipeline and BMC have cut thae line. Now he is providing water through tankers which is yellowish. We daily purchase big water bottels for drinking. Last week we saw maintenance notice stick on enterance pillar of each building for whole of 12 months in advance. He promised of playground earlier but now have built a new building on that space. Temple also is not completed.I want to seek advise that 1) Should we really pay the maintenance or can we pay that monthly basis? Also, should the builder even ask to pay even when we were fooled. 3) Should we go to consumer court or RERA The builder threatens that he will bring local goondas if anyone complains or comes to his office. Kindly advise