EXCESSIVE METER READINGS NOT RESOLVED

This metering company in Pretoria has many excessive billing complaints online (Google is your friend). My electricity bill (1 person in residence) went from an average reading of 398 per month for the past 3 years to a reading of 790 in June 2019 (cost R1 568,46) and 1155 in July 2019 (cost R2 386,00). They refuse to investigate this properly, and try to blame my few electrical appliances that I use (nothing wrong with the appliances). Their customer service attitude is "pay up, shut up and **** off. They've been doing this to people since at least 2017, according to online complaints. Why does the City of Tshwane allow this company to operate? BE VERY CAREFUL OF THEM.