Impossible to cancel Telkom contract.

HI, i have cancelled for the last 14month to cancel my Telkom ADSL line from Telkom. I have been in their store so many times and every time the staff member will help me to cancel my contact, but every month i get a new invoice. About 5 monts ago i got a email from a Telkom staff member that it has finally being sorted out and that he will get my invoices cancelled from the time i stopped my contract. I am now being BLACKLISTED by TELKOM for not paying my outstanding invoices.