RCS Cards, Charges they dont mention

I know that the Dion Wired Card is administered through RCS, but I bought a fridge from Dion Wired on a Dion Wired Card (RCS). I then went back a few days later to settle my account. The assistant at Dion Wired called through for a settlement figure and the full amount of the settlement figure was paid on 25/09/2015. I then received an account from RCS saying I still owe them R100.01. They had not included the activation charge in my settlement. I don't see how I can be help responsible for this and will take this to the Ombudsman if needed. I definitely do not recommend anyone getting a Dion Wired Card or any sort of RCS card as its just a *******!!! I want the account closed!