UNFAIR TREATMENT

I am a long standing client of Telkom and I have a normal landline contract with them. Two months ago my monthy bill contained a huge amount of R785. i called to query that it relates to ADSL line. I then asked what ADSL line as I never asked for such services as I have been using month to month MWEB ****le. I was then told was arranged by was not told by whom. I then asked that they amed their records accordingly as I have never entered into an agreement/contract re ADSL with Telkom. The consultant advised that he was busy processing that. I further sent this complaint to their escalation mailbox and have never received a response from them. A week ago I got a call from Telkom informing me that the ADSL line has been cancelled. I continued paying my monthly excluding this mysterious R 785 and I normally pay in advance or more than the bill amount. Yesterday I made a further payment of R300 as i pay via eft. Today I received sms from Telkom informing me that I must pay the R785 in question or else my line will be suspended. I honestly feel angry & unfairly treated by them to debit my bill with ADSL line I did not arrange for. Please assist me