Unauthorized Billing

After several emails to Trudon trying to resolve the matter regarding a wrongful internet listing where they published wrong information and still insist that I must pay for it, I received my Telkom bill this month and to my disgust saw that Trudon has billed me for this web listing! When I contacted Telkom customer services they told me they cannot do anything about it, I must resolve with Trudon. I must have prove that I didn't authorize this!! How ridiculous! How can a third party make changes to your account without your authorization and you cannot do anything about it? Is it not against the Law? What about my consumer protection? How can Telkom allow a third party to bill something on my Telkom account without my knowledge and authorization?? The Telkom account is for my telephone services primarily and that is the reason I have a telkom account, so how can this be allowed?