Housing Association Rules

We are in a situation where we have purchased an apartment from a builder during the under construction stage in 2014. Project was launched in 2011-2012. Builder started foundation in early 2015 and erected the 8 floor structure with tiles in flats etc by 2016. Till date the builder has not completed the project but forced owners to register and pay all balance amounts. No amenities completed and needless to say the building looks worse than a cheap govt building where he marketed it as luxury apartments. Builder got a Commencement Certificate dated August 2016 (after building was erected) so that penalty cannot be claimed by buyers as a clause that was included that said deliver 2 years from CC. Furthermore, he manipulated and got a OC (aug 2018) No permanent BESCOM power supply till date after full payments. So in 2019, some owners registered an association under KAOA to fight the builder under one common joint body. However, office bearers are not pursuing legal action but demanding owners like me who have registered the flat at the registrar BUT NOT TAKEN POSSESSION FROM THE BUILDER OR THE KEYS since they have occupied the incomplete project and want to maintain it for their living comfort as builder is not paying for security / housekeeping / DG etc Including extra buffer amounts. What does the law state ? Are we obligated to pay maintenance to the association in this situation for the flat in the incomplete project where the builder has not done official handover to the association as yet ? And we haven’t taken the possession letter or keys from the builder ?