Water Bill incorrect

I have received a Letter from City of Cape Town that I will be handed over to Collections due to non-payment of Water. My water bill has been incorrect since day 1 which was few days after Bond was registered. for 2-3 days I was quoted R1500. There was a discrepancy with previous Owner's balance which still needed to be paid and said to settle it. I haven't had time to sort this out as I had a Baby in that time and could not go out into cold rainy weather with a new born. I could not have someone else sort the problem out. I am back at work which is demanding but the bill is increasing. I sent an email to City of Cape town a week ago with no response at all when I need this sorted soonest. I want to settle the bill but with CORRECT AMOUNT!!