Majority of flat owners not paid maintenance for 7year and I paid it deligently for 7 years...

Dear Sir/Mam, Its big complicates story that i want to share with you. I have purchased one 1BHK flat in my native, konkan in Sindhudurg district, in 2014 in building that has total 21 flats in it (six 1bhk and fifteen 1RK). I have paid all the amount (Rs.16 Lac) to builder while purchasing the flat in 2014. Since then till date (2022) there was no action taken by builder to form society. I have been asking builder to form society past 3-4 years, but no action taken. In Jun 2015, builder asked all flat owner to pay Rs.300/- per month toward maintenance for him to be able run the building maintenance cost on monthly basis (to pay common electric meter bill) until he forms the society. So I started paying him Rs.1200/- quarterly starting Jun 2015. But except 2-3 flat owners along with me, other flat owners (17-18 flat owners) didn't paid any maintenance to builder past 7 years. So flat owner like me, who have paid maintenance @Rs.300/- per month past 7 years deligently, is suffering now. With majority of flat owners (17-18) got benefit of water and electricity from common electric meter past 7years without paying anything and now they themselves deciding to wave off their past 7 yrs contribution and forcing me to start contributing for building maintenance without forming society and also to contribute for common electric bill of Rs.30,000/- wich occured due to one of the flat owners fault (who didn't paid any maintenance past 7yrs) in Feb-Mar 2022. On top of it builder is not looking into any matter now saying he is ready to form society and all those 17-18 flat owners (who have not paid any maintenance past 7yrs) should contribute past 7 years maintenace to society once its formed. 17-18 flat owners enjoyed benefits past 7 yrs only because me and 2-3 members paying regular maintenance and they have decided to wave off their past 7yrs contribution and forcing me to contribute forgetting the past that too without forming proper housing society. Those 17-18 people are not interested to form society and wants continue by contributing as and when required. So i feel its in-justice to me and need your suggestion on what should i do in this situation. Regards, Milind Sawant