1. In the instant matter, you are the consumer and the builder is the service provider.
2. If the builder has not complied with their agreed terms, you can file a complaint case before your local District Consumer Dispute Redressal Forum alleging deficiancy in service and unfair business practice demanding payment of the rent with arrears within a fixed time frame and penalty for each days delay thereof with interest, damage and cost.
3. If all the tenants file the consumer case together, then it will be to your advantage financially.