Water Shortage in Devland

We bought houses in Devland, I personally moved in on February but since April we have been experiencing the shortage of water through out the day and since RBA is the one who sold this houses to us, we feel it should take responsibilty in sorting this issue.We have water from 7pm to 6am depending on the position of your house, if your us is on a steep hill then you have water from 8pm to 6am, then month end we must pay municipal rates for the water that we only get for only 12 hours a day. And the funny part is we started experiencing this thing when many people started moving into their houses. This has to be resolved cause honestly its frustrating, how do we enjoy our houses while we dont have water then come month end we pay many thousands. With all this water issue you expect us to give good referrence to other people who wish to buy houses from you. Put youtrself in our shoes.