******* Phone acquired

I discovered in February that somebody bought a phone on my vodacom account. I contacted Vodacom legal dept. to report this and to also block the cell number.I was told to ask the accounts department to change my payment method from debit order to cash,which was done.I paid my account for the other two contracts.no further updates,when I eventually contacted the call centre to find out the progress I was informed that they sms'd me to fax an affadavit with my ID to the ***** dept.They send the sms to the blocked number which needles to say I didnt get the sms.I then faxed to them the required documents.No feedback at all,today I phoned them again,to discover that the fax number that was given to me was incorrect and they didnt get it.In the mean time I keep on getting messages advising me that my account is in arrears. I will definetely not be renewing my contract again.I have this account with vodacom for over 10yrs ,never skipped a payment and now this! The ********** transaction has still not been reversed of my name.