Consumer Redressal

i had submitted a request for cancellation of broadband services to Airtel KOLkata for landline number 03340603108 on 21.06.2013 , reference number being 34485190 and have been paying my bills till now. the service to the aforesaid number has been discontinued for over a month now but even today am getting bills and messages from the company to pay . on saturday august 24th again have recieved a message from the company asking me to pay rs.954 for bill dated 09 august 13. How long am i supposed to pay the bills despite the service being discontinued and having asked them to terminate my services Why am i being harrassed and mental agony caused by them