Telkom Sucks as usual

I cancelled my telkom home line that I used for internet purposes due to the line being out of service for months on end. I was told that I need to give a 30 days notice. I went into the branch at Mall of Africa & completed the necessary cancellation document. Then I was contacted in February stating that my account was in arrears. I emailed them the cancellation form and was fortunate to have been copied on an internal email regarding the cancellation. I assumed that the issue was put to bed. Then sometime in April, I was contacted by Predisha from MDC collections stating that I have been handed over by Telkom for an outstanding amount of R1000. I disputed this and sent her the cancellation documents. After much back & forth, I was told that I owe Telkom about R600 - which I am still not clear about what the amount is for? Then, I app**** for a credit card in May and found out that I am blacklisted by Telkom for an amount of R 80000. I am exhausted trying to get to the bottom of this issue with the various call centers. The following needs to happen ASAP: 1. I want to know for what amount and why I was handed over as I received no notice of any monies due to Telkom. 2. I have been blacklisted for R 80 000. Please explain?