Debiting my bill without my permission

On the 15th August 2014 , I noticed my telkom account be debited for ads in the yellowpages. I contacted your offices notifiying them of I had no knowledge of this and requested the recording. Once listening to the recording it noted that the confirmation was done with the seceretary and no one of management level. I cannot understand how trudon can just call and speak to anyone and accept a contract of R728 per month obiviously the call center agent just wanted the order . I am sure you have our detials on file. I spoke to a Mr Modala on the 26th August who requested me to send him and email , got now response from him then send it again on 29th ..No response again. On the 10th of feb I spoke to a christainsons and was told to forward the email ,,,,still again now response .... IT IS ******* TO DEBIT MY ACCOUNT WITHOUT MY PERMISSION ...Please address urgently