Over charged water services

I am very disappointed with the service. I have been over charged for 3 months in a row. I wrote an email complaining about the charges and no one responded to my email. How can a family of adult and 2 kids pay R2500.00 for water usage. This is nonsense. Please rectify the reading. I am not always home. It's been 3 months and I paid almost R5000 for water. Water should be the cheapest commodity of all time. I called last month you said there might be a leak, we checked, there's nothing. I am going to take this up with ombudsman. I can't not be reaped like this. Water cannot be expensive more than electricity.....no ways.