My attorney had a word with a tracing agent who has an office in Pretoria. When this guy called his Pretoria office and described the situation, they started to laugh. Apparently this bogus attorneys are quite well known but he hadn't heard of them targeting people in Cape Town. The tracing agent in Pretoria said it was obvious that they either had an "in" into Telkom's accounts, or more likely could access the Telkom billing computer, which is easier to hide, since the record of people logging on is so involved that it creates over 2000 pages of record a day and nobody ever looks at it.
Apparently, Telkom phone billing and ADSL billing are two completely different departments who do not speak to each other, or share any details and the whole design is a big mess