Charged for Airtime to non-existent account

I was using the Standard Bank mobile app this morning and was purchasing airtime using it for the first time. It was not a great UI and the following happened: I selected to Purchase R100 of Telkom Mobile airtime instead of MTN. I entered my MTN number correctly and confirmed the purchase, an error came came back saying that the top-up did not work because the number is not a Telkom number. Fair game. The problem is that I was still charged R100 by Standard Bank even though the transaction was not successful. This does not make sense. Standard Bank will not be paying Telkom Mobile R100 because there was no transaction, but I was still charged. I called the number on the payment notification SMS, after having my number transferred 3 times to the incorrect department I spoke to someone from the airtime department. I was told that I cannot get a refund even though Standard Bank charged me R100 and are paying Telkom R0 - ****************! I asked to speak to a manager and was on hold for 30 minuted before I decided that was enough.