High electricity Tariffs

My electricity balance for July was R300 for all of July. Suddenly towards the end of July they inform me that my bill is - R2084. I didn't get a notification to say that my balance is running low. I paid an amount of R2500 and overnight my balance is R144. I've never experienced electricity usage rate that is this fast and high in my entire life. There is no transperancy and they don't give us feedback. This is the worst experience I've ever had from an electricity service provider! I have never in my life spent R2000 electricity in one month! They will not give me any feedback.