Reliance Communications — rent not paying

In our land there is a reliance tower which kept on agreed rent but from past one and half year they are not paying rent and also no agent is available to ask about the issue. It is too bad as not paying rent and also they also have to pay the interest for this and one thing is they paid rent through cheques which from one and half year not one cheque was given and no agent is available as one person giving cheques gone from the place he lives. So, now whom we have to ask and also we uploaded our bank account details to them for paying directly to bank.