Not picking up my payments made

I am unable to reach this municipality, on the toll free number you never get through to anyone, you wait about 30min and then get disconnected. I have tried for over a week now. When you submit a query on there website, it takes them a very long time, they don't read the query correctly so it does not get resolved. My problem with them is, I have paid my account but they are still showing me an outstanding amount.