Account flagged for an outstanding amount that was NOT COMMUNICATED

I had an early cancellation of my contract with Vodacom in Dec 2025. After paying everything on the quote provided by their agent, long before my scheduled debit order date, they went on to flag my account as being in arrears. This amount that I am supposedly owing was not communicated with me - not via email, SMS or invoice. Instead they sent me an invoice with the normal amount that I pay monthly and then deducted the 60 something odd rands in my account without ever telling me about it. This has affected my credit score and I am not impressed. I will complain on all social media platforms until this is fixed.