No Wi-Fi service since upgrade

I have recently upgraded my Wi-Fi contract telephonically after being called by a sales lady and since then there is no service at all. I've been to the telkom store and staff were unhelpful and unfriendly, they said everything on the system shows that it has been activated but no data is being used. They logged a call supposedly for a technician to come out but the lady that called me said she was from sales and gave me the customer service number when I told her the issue. I called twice and received a reference number and was told it will take 9 working days to resolve. In the meantime I have no internet service at home until such time telkom eventually decides to help. All I want to do now is cancel the service. I'd like to stop the debit order until the issue is resolved.