Appalling service

On the 4th 0f March 2020 I made a payment to Multichoice Africa for a years subscription with my credit card. Two days later I noted that the moneys did not come out of my account. I called Nedbank, and after the agent that answered the call verified that I was the account holder, he checked and verified that the payment had not gone through, and suggested that I should repay. I did the payment again. A couple of days later, I rechecked my account and noticed that 2 payments had been made to Multichoice Africa. I called again, and after the new agent verified that I was the account holder. He confirmed that yes 2 payments have been made. I explained what happened, and he suggested I submit a dispute form. This I did on the 7th of March and received an automated acknowledgment of receipt. In the meantime I have written to several relationship managers and only got a reply from one. Ended up that he cant help me and he has also gone away. Others are yet to reply. Dstv zimbabwe have not received the second payment. I have no idea how to get this money back in to my account, besides flying to joburg (when the lockdown is over) and seeing the bank manager face to face. but this will cost more than the 825 US dollars. Terrible really