Owners Association blocking to park Visitor car parking area

The owners association is right in saying so.  PRACTICALLY SPEAKING, as you are going to live there with all other owners as your neighbours I suggest you to accept their view of renting a car parking space, as a legal proceeding challenging the owners association would lead to peaceless situation in your apartment.  Please note that A NEIGHBOUR IS A PERSON MORE IMPORTANT THAN A RELATIVE.

Kiran ji, I think you should have taken a letter from the builder regarding the parking space alloted in your name paying whatever charges necessary for that during the time you bought the flat. Usually this is the procedure followed and there it will be mentioned about the number of parking slot also so that no controversy arises afterwards. In your acse, I think owner had orally assured you and now you have to face the consequence. As Krishna Sir, told, you cant go against your neighbours.

Is yours a co-operative housing  society? It appears that it is not.  Where in India is your building? How many flats are there in your building? You want to park your car in the open space. Are there other cars parked in the open space? Is parking space still available in the open area?   If you are honest and you are convinced that the other party is unreasonable and unjustified you can always fight for justice. So not too much worry about the advice of Lord R. R. Krishna.