Common area maintainance deposite

I paid the amount of 90k to the builder as a deposit for CAM(common area maintenance ) at the time of purchasing flat which included in my package. now the Ad-hoc committee proposes the amount of 1lac to each flat and needs to pay to remain amount for 2 bhk owners only because the other 2 buildings have 3 bhk and all they paid 1 lac or more amount at the time of purchasing the flat to the builder. Builder never discussed this 1 lac amount for CAM to everyone and not even mentioned in the agreement which done between me & builder to pay this difference(in my case its 9900 rs). in our last GBM which was held in Jan 2020, 37 owners were present out of 240 flats and no one agreed on this point but when request them to re-discuss this point in GBM but secretary said its already resolved and the same point will not be discussed again in the next GBM. It's not mentioned anywhere to pay 1 lac amount and all the committee heads are from 3bhk only and because of it, they want to be pay 2bhk owners also the same amount.