Fungi Utilities billing discrepancies

Fungi Utilities have discrepancies on their system . As tenants using Fungi we get randomly overcharged with no indication of a possible issue. My balance went from R241.72 yesterday and jumped to -R629.06. How is that even possible if my average daily consumption was R38.03? Every month there is always a glitch. In May they charged over R700.00 in a single day whereas the average daily consumption for the other days was R34.00. Also my eWallet Balance appears to be negative on previous days but it positive. It seems numbers are being manipulated.