Builder allot already occupied parking to new resident without consent

I have a flat and have got the possession in the year 2015. At the time of possession I was given parking lot no.1088. Since then I am residing in my flat and parking my car in the allotted parking lot. Suddenly few days back I was told by society maintenance team that I need to park my car in parking lot no.1231 as my earlier parking lot has been assigned to another resident,who has got his flat possession in 2017. How can the builder allot my parking lot to some one who has taken possession after me? Any legal solution pls do let know. I am a Hindu.