Charging of electricity and water

I stay in 260 marshall they charge us electricity while we use prepaid and when you query about it they told me is for geyser and I ask them starting from when because I never get any notification about it and I ask why are you charging us electricity for only three units what about other units that are also using common bathroom they said they will look into it and mind you I query about it since last year and they keep on charging us and I didn't pay the money I only paid what I know I should pay, now they are forcing us to pay the money and they even deactivated my finger print. And to add on that they told me their book are not balancing which they should charge money so their book will balance. What I want to know is why are they charging only 3 units in the building what about other units and why was no communication about it. Am asking myself that the owners of the building did they know the way tenant have been treated or what we query the don't see it. And another thing is about water they also charge us alot of money 3 unit paying almost R2000 but at other unit they are paying less when you query they will send you a video of how they charge water. The management should know how to communicate with tenants