SARS and Medaco Revenue Solutions ...****sters or legit???

I have been unemployed for 9 years. In July 2024 I received an email from Medaco telling me that I owe SARS R2500. I emailed back informing them that that was seriously just totally impossible. No response. Then end of November I received another email from them (Medaco) telling me that I now owed SARS R4500!!..***!! I accessed my SARS details on EFILING (Statement of Account), and the total outstanding balance is NIL, which is correct. I have seen posts on Facebook of people complaining of similar cases such as mine, been harassed when there's no amount outstanding to SARS. SARS need to get involved asap and sort out this nonsense!! I'm wondering if this company are ****sters!!??