CANCELLED SERVICE IN OCTOBER AND CONTINUED INVOICE

During October 2015 I cancelled my Telkom account by email. Nothing happened. I visited the Telkom branch , in Colonade near Pretoria North, during November 2015 and January 2016 without any success. I am keeping being invoice for use of lines, without the account being closed. Now I received a final demand from Telkom. All that I want was for my account to be closed, at the end of October.