Telkom voice bundle purchase

I purchase an All Net Voice bundle from Telkom to add to my account that was depleted. I know that the Telkom website is not the most user friendly application and I was very cautious during the transaction, making the selection on the transaction. As the system does not indicate exactly what you are buying I was went back in the selection to make sure I selected the correct product, not realising that the transaction actually went through. I continued with the transaction and at the end actually purchased a second voice bundle of 500 min which expires in one month. I will not be able able to use on of the 500 min voice bundles by the due date. I contacted Telkom as requested a reversal of the second bundle purchased within minutes of the first one, which they refuse. It is now part of Telkom policy not to reverse transactions. I enquired on my next possible steps to resolve the issue and the operator tolk me that there is no one else he can refer me to to resolve the issue and that I’m at a dead end. It is impossible for me to use 1000 all net minutes in 12 days. Would appreciate some assistance.