Electricity charges

Hi

I called the call centre and spoke to Promise, I asked her to explain to me how I can have 26 rands on the account, then the following day I am sitting on -R456. She tells me its a consumption that pulls thru, I asked her where it is coming from and she hangs up on me. Can you please handle that? All I asked was to be shown where to see that on the website, because it does not make sense. I buy and then use, and then I get charged - how am I getting these extra charges now? Also, she is the worst customer service rep ever. EVER. Fix this