[Resolved]  apartment society — leakage in flat

sir, in this i would like to state that i`m having a flat in alkirt elegant app. in indore, there is leakage i n my bathroom roof beacause of bathroom of my just above flat. pipeline of sanitary of above flat is damaged and the drainage water start leaking in my bath area, I`have informed him and the society to repaire it but they told me if you have problem then repaire it by own expenses. now when i agreed for that they also not allow me to repaire it coz the flat owner want to sell it and demanda that he allow only when i use high quality materials instead of what is presently on it. so please guide me what i do, and tell me is this is his reponsiblity or mine to repaire his bathroom that causes the leakage in my bath area.