No progress with regards to my account

In November 2019 a large sum of money was taken out of my business account and my bank informed me that Sars issued a mandate to do so. I've followed up with Sars and the money is not reflecting on their system to date. I've been dealing with Jennifer Kotze she's escalated the matter to her senior manager who seem to not be looking into my matter. She has however said this could be ********** transaction but no one is investigating. I'm gatvol