How do you close a Telkom account??

In January this year, I had a Telkom line installed to allow for internet access at my home.The guys were very prompt with the installation. I then tried connecting my wireless router, without any luck. When I got hold of telkom, they told me that there are NO available ports in my area, and that there is a 3 month waiting list (at least). At that stage I asked for my account to be cancelled as I was not prepared to wait for 3 months for internet access. I was contacted around 2 months later, asking why my account was in arrears - to which I responded - My account was supposed to be cancelled. I asked the lady on the phone to put through an account closure request, which she confirmed doing. it is now August and I have just received another bill from telkom. i have not ONCE connected a phone to this line, or made use of the line. I have asked for the account to be cancelled a number of times. Trying to get through to telkom is a disaster as I end up holding for no less than 20 minutes each time. I now have an outstanding bill of R1623.30 which I refuse to pay. Terrible service telkom!