I had received the demand notice of Rs 194000/- + interest to be paid for A.Y 2011-12 but earlier i had not received any notice of filing return or assessment hearing as might be due to change of my address. Now i received the demand notice to pay the amount. Please guide me what should i do? Can i file appeal for the same or rectification request and if so within how much time should i need to file as the time has passed?