I have EVENTUALLY, after lots of back and forth on that page, found the area where you request it for your area. Let's see if that actually counts for something to them.
"How did you do that?", you might ask. Well, here is where I found it:
On that page (
http://www.telkommobile.co.za/smartbroadband-uncapped-wireless/), scroll down to the section with the heading "A first in South Africa with Telkom. The sky is the limit with Uncapped Wireless Broadband." In that section there click the button "FIND OUT MORE ABOUT LTE". In the section that opens then, there is a "coverage map" link. Click that, then search for your area using the text field in the coverage map. If you are not covered, you will then get the option to fill in a form to fill in details to inform Telkom that you are interested.