Charged for service not used or signed for

Charged for service not used or signed for. An amount of R8.50 went off every month that I was not aware of or saw until I looked at my invoices closer. This was not part of the contract. Has never been utilized at all. I used Telkom mobile chat to sort this out, they were able to assist in removing CLIP from future invoices, but I requested a refund as it is unacceptable. he (Edman from Telkom) said no. I then asked for contact details of someone to take this up with. I then got a reply that I am not responding and the chat will be ended even though I responded. I asked for the contact details once again and he ended the chat. This is totally unacceptable customer support as well as business practice!!!