Telkom Just gets worse!

Please see previous complaint for history. After a hell of a battle I thought my bill was corrected, I received my June bill with the correct amount and a credit. Well it only lasted a month, My July bill included an amount listed as contracts of R932.84. When I phoned I get told it is because I have changed my crontract, told them the story and they do what they do every time and log a dispute. I've had it with Telkom, I haven't had a correct bill since August, so I have decided to cancel. However after hanging on for a looong time I start to go through the cancellation process and they cut me off. Why is everything so difficult? If I didn't have to have a phone line for internet I would never use Telkom again!