NO SERVICE FROM OUR MUNICIPALITY

I cant call this service cause their is non. I have been struggling the last 8 months to fix my rates and taxes account. Recently we installed a pre-paid water meter and still being billed from the municipality. The account range anything from R4500 to R6500 a month. After the pre-paid meter was installed the property used +-R250 of water for the month. How do you compare Pre-paid meter using R250 of water vs the municipality water bill +-R5000.