Telkom -incorrect Credit Vetting

I have been a client of Telkom for many years. I have an existing Telkom mobile contract which is due for an upgrade since September,. I have been called by Telkom to upgrade. On Black Friday I purchased a deal.After signing up for the deal the agent put me through to the cancellation department. My current account was cancelled and I was informed this morning that my transaction was declined due to credit vetting. I have no debt, I have no late payments, I.have no bad credit record. I find myself in a huge predicament. And couldn't find an agent that could help me. I was sent from one agent to the next and acted upon their instructions. I am not sure how to proceed now.