Termination of ADT Service

I have tried time and time again to get hold of someone for the cancellation of the services but no joy , I was only with you for a month and was not happy , I sent emails to the cancelations department as well as returned all your stock at the Alberton Branch where a lady made me sign and send to your head Office. Im getting messages saying my account is in arrears and we both know that's not the case. I understand you a big company and rarely have time for small fish like us but really I either need the Top managers number or the Owner of the company to take me off the records.