bad service

I Received a statement in December which so by the way i had to call for because i never received one and to my surprise it was for R2408.10 before making the payment i called and the same statement was send to me. today 07.01.2016 i called as i received an sms with my new bill and to my surprise wham R1045.16 so the consultant i spoke to Selena Walenj not VERY HELPFUL AT ALL might i add told me that my previous bill was not R2408.10 it was actually R2500 and some odds but the more i tell her that i even have an email here to show that before i paid i call and this is the amount i got the more she told me that that's the amount i was suppose to be pay. the frustrating part about all this is that you get no joy from the government places at all!!! they will be so quick to come switch off my water if i do not pay but they are so damn lazy to come out on a monthly basis to actually get a proper reading but its ok to just send bill for us citizens to pay!!!! please can you send someone out to do a proper reading on my water as this is acceptable i cannot a get a bill for this amount every month and yet we are 2 adults and one infant staying in this property.