In my view, the society is asking you to pay the fees payable to the society under the following directive and the claim of the society appears to be correct based on the below directive.
Directive to be given to all co-operative Housing Societies in the Maharashtra State Under section 79 (A) of the Maharashtra Co-operative Societies Act, 1960.GOVERNMENT OF MAHARASHTRA, No. SAGRUYO-2011/PRA.KRA. 360/14-SA, Co operation, Marketing and Textile Department, Date 15th October, 2011
Under section 3.10. Transfer of flat and transfer fee, sub clause 13) Amount of Premium shall be maximum Rs.25,000/-. Similarly it shall be Rs.25,000/- or the amount which was approved by the General body meeting of the society whichever is less. The said provision is applicable to all the flat and plot owner’s of society.
However the previous owner is liable to pay all of the maintenance charges till such time you took possession of the property.
Hope this helps.