Both Medaco & UIF fail at basics

In Aug 2022 I received an sms telling me I owe the UIF department money. Since then I have been trying to get this company & the UIF department to understand that their records are incorrect. I've even sent them documentation to prove this as well as the UIF (more than once), but still they can't grasp something so basic even if it is handed to them in black and white. How can something so easy be so difficult to understand if it's right in front of you in documents sent by the client to both entities? They seriously don't have a clue what they're doing.