Car parking

hello, our society has about 333 flats and about 240 car parkings (stilt + open). the builder has issued allotments letter heremarked the parking space (stilt+open) to the 240 flat owners before formation of society, and stating once the society is formed, all charges, rules and regulations to be follow bye laws. society has been formed in 2011 in subsequent year the committee members adopted in their agm that they will adapt the allotment letter and continue to follow. the builder then sold the remaining flats without car parks post 2011-2016. i have purchased my flat in 2015. i have submitted an application to the society for car parking, the society says no parking available, but members who have car parking are renting same to other members who dont have car parking. also some flats have been sold and the parking lots of these flats have been transferred to new flat owners. is the society action legal? the builders allotment letter clearly says that once the society is formed all rules and regulations to be followed as per bye laws. thanks