Appalling customer service

I went to Centurion Telkom shop to upgrade my Wi-Fi. The consultant did not first check if there was stock of the mifi router. On checkout, it was only then that he noticed there was no stock. He then opened another account and promised to cancel the other one later. To date, I have been fighting to have the one account cancelled as I did not use it. Now I’m been charged a cancellation fee for someone’s mistake. Please sort this out urgently as it’s affecting my credit profile!