UCT online high school accounts department frustration

Super frustrated with their accounts department after numerous emails proofs of payments attached, UCT online school has stil not resolve or corrected our account. They simple just resend their statement with invoices exceeding 12 months our child has only been there for a year.

It’s an absolute nightmare. The schooling is no problem it’s the statements and the accounts department No one actually looks at your emails and attachments. Yet you receive warning letters! Can someone please help!