1) the apartment association cannot discontinue common amenities facilities
2) further the association is bound to furnish receipt of maintenance amount paid by you
3) association cannot charge penalty of Rs 50 per day unless there is a resolution passed in the AGm tot hat effect
4) you can issue legal notice to association to provide receipt of maintenance paid by you . to restore power back up facilities and question basis on which penalty of Rs 50 per day is charged
5) you can move court and obtain a stay against the association form charging per day penalty on maintenance and from refusing to permit you access to common park and other facilities
6) you can also file police complaint against the office bearers for criminal intimidation under section 506 of IPC and for disconnecting your power back up