Society Parking allotment

We are very old resident of the society, our society had went to redevelopment and during the time we had received a agreement which is also stamped by the society where the builder has explicitly mentioned that we have been alloted S6 OF the parking space and given a floor plan for parking this is a slit parking space at the ground floor of the building just below the society. The society is also Charing maintainance for the same. Now society is giving permission to other member saying that we don't own a vehicle where as all member in the society have their own parking which is sufficient to them still for ease of use people park their own vehicle. When we asked the society they mentioned that we don't own that space and it's property of the society. So they can give permission to members. However, the agreement of the flat clearly mention the numbering of the parking and the floor plan and confirms that the parking has been alloted to us. The agreement along with all pages has been stamped by the society stamp. Can anyone help me to understand what can be done as they don't allow my guest who are visiting us to park in that space and they always have to park in open if four wheeler as the place is already occupied or their vehicle is moved to unsafe location in case of two wheeler. I ready many terms confirming we don't own that space however our agreement of redevelopment mentions that that particular space has been alloted to us. If anyone can help would be great also please mention the bye law of act by which we can be supported. FYI- They have not discussed this matter in any meeting which included us. I am unsure when the permission was given and no special resolution was passed.