Unreasonable disconnection warning

We had a burst pipe before lockdown, which resulted in us being billed for the water during this leak. We were informed by staff that we are not liable to pay as we did not use this water. Lockdown then happened. After numerous calls and emails regarding the incorrect estimation and billing on our municipal account we received a credit for the incorrect reading. However, we have still been billed for the water usage that occurred during the leak. As a result we now owe R12000. Today, we received a disconnection letter..........how am i supposed to pay this? Also, the staff has stated that we would not be liable to pay this, we have sent numerous requests for this to be sorted out. Can i also add that throughout lockdown, i have never missed a payment and even tried to pay abit extra every month This is really disappointing that we have to call, complain and send numerous emails to get things sorted out by the CoCT but after 1 letter from them they want to do this.......