Telkom the Worst company of the year!!!

Telkom is probably winning the title of "The worst company" by huge margins. Last year i requested a 4mb fixed line. It was installed but the speed was not even 1mb. After 2-3 frustrating months i requested to cancel the line on phone which they said is done and the "call is recorded for quality purpose" In January i found out that they still charging me for the internet, i went to east gate branch where they said there is no trace of my call, ill have to do it all over again. I did it but telkom is still charging then i went again and they told me the same story. after few months and few visits finally in Carnival mall branch they said u can order online without any docs but to cancel u must send us a letter on ur company letterhead and she promised that everything thing will be ok this time. But telkom is champion of false promises and i was still charged for the service i cancelled months ago! i went to Carnival mall, springs mall and east gate mall branches, atleast 4-5 calls and im still unable to cancel something that i don't use. i asked them on phone that if there is an office where i can go to sort this issue but the answer is No! I mean if u have a problem with voda u go to voda world, MTN have there office where they help their customers, CellC have their office but to sort problem with telkom u need to wait for miracle to happen!! they debiting my account every month and i feel helpless as there is nobody in telkom that can perform a very simple action of canceling the TIN!