Poor service

The service is very poor.After settling my outstanding SARS payment in August already and several calls to them confirming that there is no outstanding amounts on my account they still send me messages for non payment on n weekly basis.I alsi requested them not to send me messages again and they said they have removed my number from their list and i will longer receive any messages from them to no avail they still threaten me that actions will be taken against me for account that has been settled.