Contract not activated, but still billed

I app**** for a contact with Vodacom through Dion Wired in Bedford Centre. Filled in the application and was told that they would call me to confirm approval and pay the activation fee later. When they called to confirm the approval, I requested that he cancel the application, as it was not needed anymore. He confirmed that he had canceled the application. This morning a debit order went off a dedicated account for bills. Unexpectedly so, which now means I have to pay a bounced debit order fee for something that should not have happened in the first place. I want my R100 back vodacom! How can this be possible without the activation?!