Rip-off billing by eThekwini

I submit my readings monthly via the WhatsApp bot. My July bill shows that my consumption between June and July was 700 kWh, which is correct, however I have been charged an additional estimated consumption amount of 230kWh which amounts to R754.28 extra, totalling 930 kWh. I logged this on eServices but it keeps getting closed as resolved, with no feedback or response. References: CSM***, CSM***, CSM***. I have called in and get referred to call other departments who then say I need to call the main number, not them - 6 x calls today. Still no success. One employee told me I can't do anything, I must just pay. Another says I need to call meter readings but their number doesn't get answered. My ward councillor even stepped in and emailed them, but no response or feedback. Why should I pay for extra consumption when I submit my readings- the whole point of submitting readings on the WhatsApp bot is to be billed accurately. I am disgusted by this entire situation and demand that my query get dealt with, not ignored and closed with no feedback or response.