i already closed my account then also getting invoice

Hello,I already closed my account long time ago becouse of getting every month over payments you people are just fooling people ..my account is closed when I went to elisa to close is asked that customer executive that I m paying whatever it is so later it will be closed he said yes this is the amount u have to pay I paid that which was double of my bill ...this is really scam u people torturing after closing account also I m getting bills u people think I m fool I will take you to law suit ...from one year you people already charged me double of amount and after closing deactivation also getting bill fraud people