Telkom tells me not to pay cause they overcharged me but they still bill me...TELKOM IS PATHETIC!

I have been struggling with my account since April. We even drove to Head Office to try and sort the account but all they do is let you complete a form and thats where it ends. We phone Telkom almost weekly to find out if the account is sorted and then they say the matter has been closed due to it taking to long to sort it they will escalate it again. I have a call reference and they state the calls are recorded. I told them to listen to the call where their employee told me not to pay my bill anymore until they sort my account because I have been overcharged for more than two years and he calculated that they owe me about R6000. I then kept phoning to follow up and told them that I need it sorted because they are going to let me end up with a huge bill. They just always say we will escalate it. Its end of August how long does it take and how many calls do I have to make before it will be resolved. Now I moved house and they refuse to cancel the line. I am not going to pay for someone else using a line because they refuse to cancel it. I asked for it to be moved and was told they dont have service where I live now which is a lie. Its beyond pathetic that I get told not to pay by their employee and then they dont resolve the matter since April.