Bad service at Telkom

I had a bad experience with Telkom, after 24 Months of our contract without any trouble. On the last month of my contract I called their customer service to enquire if i can terminate my contract with them, only to find out that I'm left with only couple of days for my contract to end. It was the 23of April and i was told that if I'm terminating before the 16th of May that i will pay R695.30. II told them not to continue with termination, but only to find that the lady has already terminated my contract without telling me that it has been terminated and i didn't receive any notifications or anything until i received the statement that I owe R695.30 while i was paying R330 monthly. I called them again on the 14th of May and they told me they still have to investigate the calls and they will call me back. Till today they haven't called me but they tried to debit on my account and now they telling me if I don't pay my credit profile would be ruined.