Single number service

I have two single number service accounts with telkom and the business system reflects that it's no longer active. Unfortunately the monthly debit order still goes off every month. I have contacted all customer care services and get sent from one department to the other for over a year. I simply cannot find anyone in telkom that know what a single number service is. I have been to the office in bayside tableview where these accounts were opened, the consultant that assisted me in opening these accounts has mailed the telkom i.t department without a resolution or a reply. So it appears that i am paying for a product that is unknown to telkom .Last reference number received *** the telephone numbers that apparently no longer active is *** and *** hope someone can help