UNEXPLAINABLE BILLING

My wife and I we've been renting a apartment since last year June in Fourways and never had a problem until the 19th July 2019 when the bill just went up crazy high from R139 to -R6,191.83, then again changed to -R4,859.34. Apparently our meter hasn't been charging since we moved in, that's what I was told, which is an error on their side. I looked into all my statements and what I'm being billed is too high when comparing to all my statements. The month of July alone I've spent R1700. I've been transfered from one call to another and no clear answer. Can they re-look they're billing because they're system seems to be full of error.