TELKOM DOESN'T ACCEPT THEIR OWN PAYMENTS AT THEIR OWN STORES

Seen as South Africa is dependent on only ONE telecommunications service provider, they actually have the ill repute not to accept payments at their own outlets, all payments have to be done via EFT or Third Party Payment Portals, and even if you pay via their direct payment method on their website, Myaccount, the payment takes 48 - 72 hours to reflect. Can some one explain this procedure as payments should reflect immediately via Myaccount portal?