Incorrect amount of electricity purchased

I sent countless request to Unipin asking them to reverse the electricity payment I made on Saturday and to this day no one bothered to help me. My issue is that I accidentally purchased a R5000 electricity when I actually was meant to by a R500 token. I haven't used this token in a hope that someone will understand my issue and actually assist me. I have never purchased the electricity for that amount and this can be seen on my purchase history, surely there was no way I was suddenly going to spend R5000 on prepaid electricity in one month. The sad thing is that I don't have their contacts are rely on email ********** which they never respond to. I'm really disappointed in their service and are hoping someone will respond to my email.

Teboho