Incorrect billing

I have cancelled my chubb account last year in July 2015 and the radio was removed on 01/08/2015 by Eddy from Chubb. I have sent numerous emails to chubb assist email address and I got auto replies stating that I will get a reply in a fewer days but its been months. The worst part is that I received a statement today stating that I owe for 30/11/2015 and yet the radio was removed and the service was terminated in July 2015. I want a letter confirming the cancellation of my account NGO***(YYCI6085), statement of apology and a statement showing a zero balance. Email the feedback to [Email Removed]