CITY OF CAPE TOWN DOES NOT WORK FOR ME!!

I recently sold one of my two apartments. The sold apartment has a credit amount (including a payment in error of R3000,- via Nedbank)... ,the remaining apartment is in arrears. I asked the COCT-Accounts to offset the credit amount of the sold apartment , against the arrears of the other apartment( submitted all required documents).COCT RETURN ALL MY EMAILS REPEATING REQUESTS FOR SENT DOCUMENTS!.COCT NOW HAD ME LISTED(DEFAULT LISTING/Credit Bereau).