Telkom=Teldom =*****ing single mothers money

Firstly, I tried to report a faulty line, no luck for months. Then I just canceled my line. This was almost a year ago. But Telkom just keep taking money from my account. I’ve spoken to various people on various occasions to sort this out. Every time they promise the problem is sorted, but every month they take money from my account for a service that I do not have. I’ve since moved. How do I effectively cancel my Telkom service. They are *****ing money from a single mother for almost a year now.