Reverse my second payment now

Yesterday I was making a payment on my capitec app and it gave an error I did not get any notification that the money is out I tried again and went through. So I have made a mistake of paying twice. When I tell them the problem the vumatel don't want to reverse the other amount they say they can't reverse a voucher...voucher how? It was not voucher but I need the money for my daughters transport. Vuma it's a nonsense company with nonsense network issues that they cannot solve. Please guys don't ever use vuma try other networks. They don't know how to treat or to talk to customers. It's is with my rights to do something with my money as a customers but telling me the bullsh*t they just told me it's something else. I WANT MY MONEY RIGHT NOW‼️