Benoni Ekurhuleni municipality does not have it's house in order

I have a property that I own in Daveyton Ekurhuleni. When I was married the property was in both my ex husband and myself. After the divorce every debt owed was settled and the property was then in my name. Nine years after the divorce Ekurhuleni threatens litigation claiming that there's money that needs to be paid and the account that they are referring to is the old one which was both in myself and ex husband's name. I am deeply aggrieved by this because my account is up to date and during transfer of the joint property to my name everything that needed to be paid was paid.

It seems to me that the municipality doesn't know what it's doing, how can one property have 2 accounts?