Bad administration

I paid a deposit of R3920 for my daughter's studies at Rosebank college Cape Town campus on 06/02/2024, but that was not allocated it's still outstanding. I've been writing emails to them with the hope that it will be solved but no luck. I only receive responses that are saying that the financial department will deal with the problem. Every time I write to them I always attach a bank statement for them to see that the money was paid, I don't know what to do because this will affect my daughter negatively when she completes her studies.