Cell C Desperate refund!!

Guys I desperately need help! I accidentally bought R1000 airtime instead of 100 which I desperately needed to pay for electricity for the month. I called Cell C and they said they couldn't help me. I called the bank and they said the same thing. I'm so torn over the fact that there are no procedures for something as simple as making this mistake. This feels like outright greed. I understand that they want to make money, but we are also the loyal customers who have been with them for years. Is there no one there is trully looking at all this and is burdened with running this company in a respectable manner? This is really depressing as I don't want to have to try take a loan just to keep the Lights on when I had the money to do so less than an hour ago. Is there anything i can do to fix this? who can i call? Please guys, i need your help desperately.