1. Society has no right to dispute the title over parking space , more so, when your agreement is with you.
2. Do not pay much attention to them as they can not refuse your titile over the stilt parking space.
3. If they pose problem to enjoy the same you have legal recourse to get your right over the parking space.
4/ You can ask your seller whether he has got any photocopy of the same with him. If the said agreement was registered one then you can apply for its certified copy.