I think there is come confusion here.
Telkom usually setup a dial up (also called PPPOE) account in Windows, for this to work the modem needs to support bridemode or 1/2 bridge mode. Problem with this is additional devices will have to dial the same PPPOE acc, whcih can be troublesome for the everyday client on devices like iPads, Android phones etc.
In RSA ADSL accounts run over PPPOE, this is setup INSIDE the router.
Adan - setup the modem as PPPOE (on the modem side), no need to setup a dial up PPPOE account in Windows, this is a old way, one generally "only" useful if you have mutiple DSL accounts you wish to dial using 1bridge or 1/2 bridge mode.