Unreasonable electricity billing

On the 2nd April 23h39 gotten an email I've got R99.33 electricity left, then around 01h09 was left with R86.22, at 02h07 left with R53.78 around 02h43 R3.08 that's what was my balance. Then at 03h32 now over due by R5.62, at 06h29 then the account was over due with R30.00 by 06h45 the power was discounted. So email was send to query the matter no one came back to us and calls were made they answer I got was it's an automated system. Which it's very strange when I log into the website the graph really doesn't make any sens while asleep the amount of electricity used was close to R100 which alot of the other tenants have the same problem. We would like to report this matter to relevant authorities. They contact *** after hours ***.