TELKOM service suck!!

I have tried to cancel my Telkom line on the 1 of October 2017. The lady told me this is one month in advance and I should phone again 1 of November. So as time gone by I decided to cancel my service with Telkom via online . On the 27 November 2017, I canceled my service with ref numbers : 05* ** **05: ********** for the line and TIN 23****07: ********** internet. every month since November I can't use the (phone) Telkom or use the e-mail adress because I thought that the service was canceled. On the 29 Nov I got a sms saying I owe R1572.22 . and since then my account has been suspended..NOT CANCELED and every month they put another R500 to the account. I send Nobenguna a e-mail as she should have sorted this out - but nothing. I phoned again and talked to Tembikile and she as well should have sorted this out and still nothing. This past weekend I went to Telkom offices in Bloemfontein 200km from our house, and again the guy told me I should talk to someone on the phone to sort this out. I then again talked to Kamzelihle and she told me I should wait till they send me a e-mail to say everything will be back-dated and sortted out. Last week I got a letter of demand saying I need to pay R2516.25 as my line is still suspended and not canceled. I do not know what to do..I'm afraid i'm going to be blacklisted for not paying..