When a company has access to a person's entire and up-to-date banking history (as well as other personal information) and is able to deduct payments at the exact same time that grants are paid, it is not an advantage of mere efficient processing. It is an advantage of operating with almost no risk. That is no risk of non-payment and knowing exactly when to stop providing any new services to a captive market (they have access to recipients at pay points and via cell phone). The contract CPS has with SASSA prohibits them from using the recipients' information for anything other than to pay grants. 

It seems you haven't been following this story closely? For more details about Net1 and its operations as well as the repercussions of this for recipients, I can recommend the excellent articles written by the author of this article as well as Groundup and amaBhungane.