Apartment issue

I Mr. Hari flat owner son living in rama plaza apartment since more than 10 years in visakhapatnam. Its an old apartment approximately 15 years. Total 16 flats, out of which two were duplex. 4 flats in each floor. In this apartment there was common walls. There was an flat owner association. Two years back, Apartment president (site owner) expired. There was a secretary also when president alive. A flat owner become a secretary after some years he resigned at that time president is alive. The secretary resigned due to his personal problems, some disputes in the apartment and more domination of the president. After secretary resignation no one took secretary charge.Now the problem is According to this apartment rules, outside common corridor is common for all. no one should not put any chappal stand. But after some years, some people starting putting chappal stand in the common corridor except us. According to apartment rules in the documents is common is half half for both flats if kept chappal stand. That means half common wall portion to one flat and remaining half portion to other flat for side by side flats. The flat next to us is other flat he is putting his chappal stand towards my side instead of his side. If we move that chappal stand to his side he is again moving his chappal stand to my side in addition to this he is putting his chappals in his chappal stand and also putting some more chappals outside. There were common walls boundary lines even though not following. So we are keeping my chappals in my side he started throwing my chappals. So started keeping chappal stand in my side and we are keeping my chappals in my stand only. Even though he is pushing his chappal stand to my side So finally he is completely pushing his chappal stand to my side. Half common wall is for us and remaining half common wall for him but what he is arguing is that window was there on his top window is to my side.Except him all were following apartment rules. If we say its against rules he and his family quarreling on us. He was torturring and harrasing my parents. His flat is near to lift and my flat is near to steps. So more than half of the common wall he occupied. Only in 3/4 th part we keeping our chappal stand.