Incorrect Billing and horrible customer service.

I have been billed R23947.93 for a week’s worth of electricity, and as a result I keep getting bombarded with notifications that my balance is low and that I risk getting disconnected EVERY 5 MINUTES!!!!! How does one use up that much electricity, in an apartment, in less than a week??????! To top it off, when I call the customer service line while speaking to a consultant and explaining my query, she just hung up on me and when I called back, there suddenly no consultants available. This is appalling service!