Legal proceedings for unfair apartment maintenance

Hi We stay in an apartment which has total 200 flats with varying sizes from 1100 sqft 2bhk to 1900 sqft 3bhk. Our association has imposed maintenance fees based on the flat square ft (Method A) as the same method was implied by the builder also for the maintenance. This makes a huge difference in the monthly charges comparing largest house to the smallest house. But the facilities one gets is the same irrespective of the maintenance fees one pays. So the extra amount is not justified as the maintenance is for common areas and not for the inside the flats.. Based on the methods which are in practice as mentioned in many apartment websites. There were proposals to have a new method (Method B) in which a fixed base rate which includes the items which are common to all irrespective of the flat sizes or number of people living in flat. And calculate the rest of the expenses which cannot be measured accurately on sqft basis. This is one of the methods which is in practice in recent time and also mentioned in the most popular apartment management services websits. The expenses which can be shared equally with respect to our apartment are 1. Security (common for all) 2. House keeping (common for all) 3. Power Generator (common for all as the cut off per house is same) 4. Amenities (common for all) 5. Common electricity (common for all) 6. Maintenance of lifts, generator and other equipment (common for all) Expenses which cannot be shared equally. 7. Water consumption (can be measured by installing meters in all the blocks) 6. STP maintenance based on water consumption Though individually people agree that this Method B gives fair way of calculating maintenance but they are not allowing the association to implement this. Since majority of the flats are of smaller sizes they have implemented Method A. And the justification given is its commonly used method. We already approached association and went to AGM but we lost this in the voting as majority (70%) are smaller sizes flats. Multiple discussions on this have not yield and results. Paying the unjustified extra amount on monthly basis forever is unreasonable. We have seen many similar queries asked in this site and other sites too. We would like to understand, have there cases been filed previously and what was the outcome? Also need suggestions on how to proceed further to file a case? The registration done under the Karnataka Societies Registration Act, 1972