No credit on water bill for over 4 months

I received a water bill of R5000, please note I am purely posting this so that my issue can be resolved in a timely manner. I have waited long enough and have been patient but I feel nothing good is coming from this.We are 2 people living in the property myself and my husband we work full time during the day how is it possible for 2 people to use this much water to begin with?When we lodged the complaint, we advised we did NOT have a water meter hence we received a estimate reading.City of cape town came out and installed a water meter, which I am grateful for however our monthly bill is still incorrect! despite this I am still waiting on a credit to my water account of R5000.Currently I have a payment arrangement for a mistake of your company!I have multiple open cases with no solution!!!! Fix this!!!!!