From the Redwill website:
So I guess you guys are wrong. Sounds similar to what Afrihost did when it launched R29 per GB. Sign up now and lock yourself in for life. Except that the topup price sucks.
I wouldn't rush to sign up though - I'd wait to see how this play's out though. These guys do everything from ICT, to furniture, properties and homeloans. Very weird, if not suspicious.
There is also no support forum or knowledgebase on their website. Also it appears that there is no way for users to login and monitor usage...