Unexplained high rates

I stayed at Grand central for less then a year and our bill fluctuated from R60 to R21000, when we asked question no one gave us a proper answer instead the ridiculous amount went away. We were then forced to move out before our lease expired due to the increasing high rates and taxes we started paying, from R60 to 580, even R700. I requested someone to come and check if there were any leakages, but they all ignored my requests,( rental pros and protea- Troy). We moved out in October, then rental pros only sent us a cancellation form now in January, two days after canceling with protea metering we recieved a bill of R3000 for the month of November and December. The flat is still vacant, and there is no usage there where does this amount come from?

When we tried to enquire a guy named Troy from protea sent us a final demand letter. Final demand within a day and no explanation? Is this really how you do business?

At the rate protea and rental pros are going almost everyone I know are trying to avoid staying in their properties.