Question relate to common area parking in a residential society per RERA Act

I live in a housing society in Ahmedabad,Gujarat that was built in 2010.My society has 15 houses and our builder of the society also lives in 1 of the houses in my society. He has 4 cars and parks his 2 cars in common area of the housing society. Whenever any other resident of society parks their car in that common area parking spot, he says “This is My spot, nobody should park this car in My spot”. I told him that it is not his permanent parking spot and per RERA Act 2016,any member of the society can park his car there on a first come first serve basis as it is a common area parking so the builder can't sell this parking even to himself or even claim his right on these spots exclusively. But he still insists on parking only his car there and would send either someone or come himself to our house to ask us to move our cars if we park the car in those 2 spots. He says since the society was built in 2010 and the RERA Act came into effect in 2016, the RERA laws don't apply to this society and like a bully he doesn't let any society residents park their cars in these common area parking spots. So what should I do in this situation?