"Service Impossible" Cannot get anyone to take ownership of a "Hi-jacked" number

I have an active contract with three individual numbers and one of the numbers has been Hi-jacked and converted into a business number - I still receive statements for the Hi-jacked number by email that haven't been updated since December. I called Telkom 5 times and got different staff all in accounts all got to the point where I was identified as the legal owner of the number and I needed my complaint to be acknowledged and receipted when, amazingly, the call was severed. I know if I call at the local Telkom agent I will be told to contact the accounts dept............... A no win situation