Telkom are *****

So I've had a Telkom wireless data account for a while. I recieved a mail from them in August with the heading "Your plan, your rules!" This is what the mail said: "That’s right, you now have the opportunity to upgrade to a higher data plan, without any cancellation fees, device fees or change in your contract period."

So I want into a local branch to find out about it. Turns out none of the staff there no anything of it, and according to them it's not possible at all.