Double debited my bank account but Telkom refuses to refund my money.

Payment for my account was overdue, I decided to settle my account with a credit card payment of R1560. Although I had settled my Telkom account, a couple of days later my bank account was debited with an of R1555.84. I called the call center and I was assured that the amount shall be refunded as it was debited in error. Reference number ***6. 14 days later I call Telkom to enquire on the status of my refund, only to discover that the refund was not processed. The consulted could not confirm if the money will be refunded nor could she direct me to a person who can give me answers. She wanted to log a call with the accounts department and again I am not guaranteed feedback. This is absolutely unacceptable. I am canceling my contract with Telkom. This company is so poor in customer service, I cant understand why is still in business.