Is Parking Allotment letter a legal document even if the Sale deed does not mention about it or states otherwise

My Sale Agreement for my property is dated 2015 with a rectification deed on the same done in 2017. The property is in a redevelopment project at Mumbai. In this agreement document there is a page attached which says that we have not been provided, neither we have taken any parking alongwith the property in this sale agreement document. Subsequently in 2018 the builder gave an official individual Allotment letter to all members of the sale flats. However the MC members all of whom are the existing society members (not new flat purchasers) are saying that this allotment letter is not a legal document and not recognised under Maharera. My Queries 1.Kindly advise if what they say is correct since Maharera ruling for making parking allotment a part of the sale agreement came only in 2024. My dates are prior to the same. 2. If the Existing MC is correct, what are the remedial measures for me to take and get the allotment incorporated in the sale agreement (if required). Please note in this case the builder is not expected to co-operate as he has left the society long back.