Billing with sign up or confirmation

This company has started billing us with no form of confirmation from the us. They did this via Telkom where you receive your monthly invoice without notice of the added service from yellow pages. When you inquire this with Telkom they say that it is Trudon / Yellow Pages and you have to contact them directly. When you call the numbers provided Tel: +27 11 (0) *** – This number says no one is working from the office and an email must be sent (the emails you send are never responded to) then you try this contact Tel: ***- and it is unanswered for days, if you lucky you get through to someone who is of no help and rather rude. They say to email and wait. Then to top it all off, Telkom says we have to pay our invoice regardless to keep our line from being cut and they will make sure we get credited but Telkom does not take responsibility that they too are adding a service without confirmation from the client. This has now been 3 months of no real help from anyone. The extra fee added has been R642 per month.