Poor service delivery

On 02 April 2019, I transferred a property from my name. In order to obtain the Municipal clearance for the transfer, the municipal rates (account number ***) required to be paid in advance. After the transfer, the municipality continued to invoice me until the transfer was processed my the Municipality. I made additional payments to the Municipality so as to ensure that service is not discontinued during the time that the Municipality was processing the transfer. Now that the Municipality has concluded the processing of the transfer, the Municipality is invoicing the new owner from 02 April 2019. I have sent through numerous requests for the refund of payments that is due to me. It has been over two years and I am still awaiting the refund.