Telkom employee made a mistake on my account

In January my previous phone was ******. I went to Telkom because you are my service provider to get a new cellphone. I was helped by a lady in the Wonderpark store. She explained to me that I would have a contract cancellation to pay. She then asked me if I want to pay it as a once-off or in monthly installments. I rep**** that I want to pay in monthly installments. Now when I got my statement for February she never made it monthly installments but a once-off. I now have a suspended line due to her incompetence. I have never made a late payment except for January. I am a good customer that now has to be penalized for a mistake that an Telkom employee made. I was at the store again today 24 February and have called numerous times for assistance and all I keep on hearing is that I need to pay more and sorry for any inconvenience caused. You want me to pay an invoice that is not yet even due. And secondly I have never given Telkom authority to link my cellphone contract with my Internet. I am loosing a lot of business and income due to Telkom employee not doing their work correctly. I am very disappointed with the entire situation and feel like logging a complaint on Hello Peter. In fact I really feel like moving my business to an entirely different service provider. I have been told a manager will be phoning me back twice today. And yet still nobody has phoned me and still my service is suspended.