shocking customer service

So I am going to give one hell of a rant now.. I had a Telkom SA line for 2 years on a special that I paid every month. Once that contract was over it immediately changed over to a month to month contract and instead of the 289 I was paying it went up to 399 without any notification whatsoever. So that my line got suspended due to me being in arrears. So i went in and CANCELLED the contract because that was ********, I didnt recieve any communication at all that it was going up. But here is the problem, YOU CANT CANCEL a line if you are in arrears you just keep getting billed for using ABSOULTELY none of their services!! Now I am in even more debt because no one bothered to tell me this and they refuse to do anything about it except keep o billing you until you have paid your debt!! Telkom that is disgusting customer service!! If i had been told that you cant CANCEL if you are still in arrears I would have done so in the first place even though the first place wasn't my fault to begin with!!! Telkom has the worst way with dealing with customers and clearly dont give a ****!!