Telkom account showed cancalled but they kept on adding charges and now blacklisted me

HI

My telephone number: ********** 301 I have logged a cancellation in June, account was confirmed as cancelled on the 17 July 2018 (reference number: ********** 1). despite this, telkom has still been invoicing me and has now listed me on the credit bereau. This is unacceptable and must be sorted out immediately. My broadband has reported this issue impacting many telkom customers and it seems that I am also a victim to the bad service. Can this be resolved urgently both the account and removal from the credit bereau urgently as I would like to apply for credit and this is blocking me.