Incorrect Water billing

We received a water bill from Ekhuruleni for R20 000 which is totally incorrect. I took a day off work in November 2015 and went to the municipality to try and resolve the issue. I spoke with Zwelethu Calvin Soko who said that the water meter number (***) on our invoice was for one of those new meters installed outside of the property, however we still have the old meter (A9119 - Original meter number) on the inside of our property. I took pictures of the meter and sent them to Calvin. To date i've had no response and the issue is still not resolved. Every number that I have tried to contact Ekhuruleni doesn't work. The phone rings a couple times then disconnects.