ESTIMATE WATER BILLING & WATER READING

For the past few years we have been paying enormous water accounts. All accounts get estimated over a period of 4 months and eventually we get an actual reading the account is over the top. Even the estimate reading is no less the R1500.00. I have queried why my water account is so high. At a stage I even had the council come out to check the water meter. They found the water meter faulty but we never got a rebate. My current water account is 96.00kl as a actual reading. I dont even own a swimming pool. I had my water pipes checked some time back by a plumber thinking that maybe my toilets or pipes are leaking. I do not even own a swimming pool and my family consist of 5 including myself by I pay R2500.00 for water every month. Some suppose to be estimated and some actual. I have reach the end of my wits as I requested a pre-paid water gadget and was told we dont qualify. My husband is currently the only one that is working and we are just just coping paying our water accounts. Why is it that we pay every month water accounts but come the actual bill it is more becos they come with an actual reading of 112 days. What happen to the months we paid for estimate R1500 - R2500?