Wrong advertising and wrongfully billed

In 2013 Trudon phoned our company to ask about advertising in the yellow pages and white pages which I gladly accepted. Our details were confirmed and they've sent a proof of the add and all were good. Then they told us about the internet listing and asked whether we would be interested, and it will be billed to our telkom account, no further communication regarding internet listing till a year later. Noleen phoned to tell us that we were listed but never billed for the internet listing and that we were liable for it. After numerous emails back and forth regarding the legality about it, which brought me nowhere!! Then I went to look at the listing and to my disgust saw that they had the wrong telephone number!! So I must pay for a wrong advertising and they don't even acknowledged that they made a mistake! I told them I was unaware of the listing, my details were listed incorrectly, but they still want me to pay! When I received my telkom account, trudon added the services without my authorization, worst service ever, can't get trough to the correct person at customer services.