Poor service

I visited Emm today to quiry my water bill. Apparently I they say I used 40kl on a house of 2 & child. Then when I get there they claim they did not do any water reading in July, but the same July I paid for my account range on the same payment I do every month. Suddenly now I must pay double how come and is they never had meter readings why my bill due in had water??? I tried to explain to the lady at enquiry but she just didn't care all she was telling me was to do payment arrangement if can't pay. To me seem like am paying double for this water... Secondly am telling them I want them to change the due date of 25 because I always get penalty for late payment, I don't get paid on 25. No I must produce proof dat I don't get money on 25, for heaven sake I know when will I have money ????????????????????