Billed for a service which I did not apply for

We have a 24 month uncapped adsl with telephone line included. The special was advertised in December. We've been paying no more than R850 per month for our account. In August our bill was more than R1200...a fee was added for a service which I did not apply for. When calling Telkom I was told I have to phone in and cancel it myself...they cannot take it off from my account, which I did and I lodged a dispute for the extra cost. I paid my usual amount. Now my line was suspended (and yet I paid the outstanding amount yesterday) and I bet I am going to be charged for the reconnection fee. According to the lady at the call centre my dispute was rejected...for what reason I do not know. Why interfere with my account and add something if everything was running smoothly all along? Now I have endless phone calls to Telkom and none of these problems are being resolved. We need our internet connection at home urgently!