Contract I Never Asked For

In March I temporarily cancelled my ADSL with Telkom. My wife is currently on maternity leave and not receiving a salary so we wanted to cut down on our expenses. When she goes back to work, we were going to connect again. Telkom cancelled the line but then they send me a huge bill for a contract cancellation. A contract which I never asked for. I created a dispute and on Friday I get a call saying that they will knock R200 odd off the bill and I need to pay the balance of about R1700. I did not ask for a contract. Whoever did the sale made a mistake and now I have to pay for it??? Is Telkom really getting that desperate? It would to cheaper for us to pay for the 3 months than to pay for the cancellation of a contract we did not ask for.