Car Parking and Sale of common Area in Apartment

Dear Sir, I have purchased Flat 12 years back from the builder. During the purchase i requested the builder to allot me a bigger parking as i was planning to purchase a sedan. As part of this he assigned me a the car parking at the end where we have additional 2.5 fts width than the actual parking which i used to put my 2 wheeler. We have 10 flats and 9 parking slot and it clearly mention by the society that there is not common parking in the apartment. The society was formed and was running fine without issues. There is flat in the parking lot and the wall touches my parking area. As per the registered document i have been allocated 8 x 10 sq ft for my car parking. As this parking is at the end, we can not park the car if anyone keeps stuff in the additional 2.5 sq ft additional width, as its drive way to make a turn to park my car between the wall and the pillers. After 12 years the the society is claiming that 2.5 sqf width falls under common area as only 8 x 10 sq feet is allocated for car parking as per the registration document. The builder is now supporting the society and said he has not received any payment for wide parking. There was never a receipt issued to any flat owner for the parking slot. The society want to sell the 2.5 x 10 sqf area for a price. In this case i raised objection and said that this belongs to me and we can not park the vehicle/car if any one keeps stuff/2 wheeler as I will hit the piller and damage my car. This additional area acts a driveway space to remove and do a proper parking. No society has sent me notice to park my car in the parking slot allocated and the common area will be sold to any interested members who ever is does the payment. My question is: 1. Does the society has right to sell the common area. 2. Does the society has right to sell the driveway that allows the cars for free movement. 3. How do i address issue legally. Regards, Ahamed