Been thinking about this story and something is missing...
“The current phase of the project is primarily focussed on the migration of Telkom retail’s residential and single-line business customers who are located in the pilot area.”
Randfontein (RRF) is a DSSU, meaning that several other smaller exchanges (concentrators) link to it before breaking out to a DPSU (New Doornfontein, I think).
Within RRF you have several exchanges (or remotes): Azaadville, Bekkersdal, Finsbury, Glen Harvie, Hillshaven, Kagiso, Libanon, Pelzvale, Randfontein, Rikasrus, Ten Acres DLU, Wheatlands, Waterpan and Westonaria.
This is not a "mickey mouse" exchange... in total there are around 10 000 customers working off this group of exchanges, of which RRF itself has about a third of them. You are also looking at close to 1500 ADSL residential customers and about 1000 business ADSL customers.
So what exactly is Telkom switching off? Something is not making sense here.