Wrongly billed and Over charging

I had three line with telkom mobile after the contract expired after 24 months i decided to cancell two and keep one . they charged me cancellation fees for what i do not know and they kept on charging for the hand set that was paid for after 24 months. I contacted them and raised the problem that I have been billed incorrectly i spoke to numerous person. After they have acknowledge and agreed on the amount to be paid they still deducted the incorrect amount and my business line is still blocked to date and this for four month now and none seems to be willing or able to tell me who should i speak to to resolve the matter. And i'm expected to keep a line which has not been in use for four months and still they are sending me invoice which claims i still owe them , that how bad their service is.<br> <br> If you can assist i would like to be put in touch with the ombudsman to take this matter further this big corporation are doing whatever they want and we are loosing money and business because of their bad services.