Housing Society maintenance charges

I have a residential flat in a High Rise complex. The maintenance of the building is being done by a society of some nominated residents. We dont have any registered society. Our flat remain locked and no body resides in it however to look after and for upkeep we use to visit once or twice in a month just for a day or so. We are regularly paying monthly maintenance charges also. Now issues are:- 1. The office bearers of so called society are asking for depositing Rs 17000.00 saying that it is an outstanding of two years back, which is in fact not payable as per my records but they are adamant not not accepting my request. 2. Whether it is essential to pay monthly maintenance charges even if the flat is not occupied ? 3. They have disconnected water supply connection to my overhead tank, for want of so called old dues. However they are saying you can take water from tank of ground floor, which is not practical solution. Please guide how can I get relief from above problem. Also if I have to file FIR please mention applicable section of IPC.