Common area Maintenance Charges by a well know builder

Respected Lawyers, I am one of the residents who bought a flat in bangalore from a well know builder. There are lot of pending issues like Temporary wiring, final coat of painting in common areas, Car parking allotment letter is pending and also no association is yet formed. There are two phases in this apartment. phase 1 was a year old and they have started a CAM for that . now Phase 2 with pending things like wiring, no proper DG backup or without car parking allotment letter issuance, Builder is asking to imply CAM from May 1 during this lockdown period. Is there a law that we can put this on hold or we still need to agree for the CAM that was taking as advance while booking the flat? please suggest. we are arguing with builder that until all the work is complete and once its handed over from Project team to Estate team we will start paying the CAM or deduct our CAM from the advance or corpus fund that was taken. Please suggest. also if there is a clause in RERA karnataka. Thanks, Guru