Accidentally bought more airtime than intended

Hello Peter today I accidentally bought R500,00 telkom airtime using Capitec banking app and when I called the consultant I was talking to said that the is nothing they can do to help me I should call telkom mybe they might be able to help, so I called telkom and they said the same thing that I should fix it with Capitec, please help me out this money was for my daughter's school stationery. The reference number for Capitec is ***9