First of all you mush make sure you adsl line and data is not on contract with telkom. (on telkom bill will say something like business 300 or so)
If not, phone telkom first on 10210. Then go through the promps, you'll end up at billing in the end. Tell them you want your adsl part of your phone line to be put in the wholesale dealer pool. (don't cancel it!!) They will email you a form or give you this link. (added the link so no call needed :) )
Give it a couple of days then phone telkom to confirm that you have been put in dealer pool.
If so, apply on afrihost page.