1. builder did not have any right to sell the car park, either under allotment letter or under an agreement
2. car park comes under common areas which goes to society on conveyance
3. so even if the person says that the car park is mentioned in his agreement, that does not make his case any better
4. here the builder has cheated both of you by selling the car park, which in first place he had no right to sell
5. you have to file a case against builder for recovery of your money
6. also since the parking is sold to two persons, the person to whom it was first sold should get the preference. It does not matter that the parking was sold under allotment letter. So society has to allow your claim before the claim of the other buyer for whom the parking is mentioned in agreement