Poor service

I went in to Telkom on June this year to cancel my adsl line. I completed all the necessary documents and was told that the process is complete, my adsl line is canceled. However Telkom still continued to bill me for the adsl line and data usage. I called the customer care line and requested the cancelation again. Again I was told it has been done. Now in November I see they are still billing me for the line and data usage. I called the customer service line and was told that cancelation can only be done telephonically and I need a cancelation number. This does not make sense to me, does this mean the people at Telkom are not equipped to cancel an adsl line and that calling the service line won't help either? And why did they not provide me with a cancelation number in the first place. I have also been told that if I don't pay my account in full my landlines service will be suspended. I have been provided with a step by step guide on how to cancel my adsl line online. I am so so angry