Absolute No Service

I've been trying since the beginning of September to have an add on service 500mb data R100 cancelled on my account. The option is online available but after numerous requests/attempts I contacted them through the Requests option where you can log a complaint because from previous failed attemtps I knew that it would not help to phone the Call Centre. For 4 months now they kept charging me R100 for data that i did not need or want. This month they've stepped it up a bit and charged me twice! I have the request history as proof of all the attempts to have this cancelled. My account is a cash account and is paid up front and in credit so i guesse they think that it is easy to take the money as it is there available for them to misuse!!!!! I've just contacted the call centre and the lady did not understand or want to understand what I'm trying to explain and then transferred me to the Credit control department who said that they cannot help me as my account is not in arrears and that they would transfer me to the clients department. I was then cut off!!! This is ****************!!!!!