refund request

I have paid Unisa for registration only to find out I was not registered even when I have paid on time, thereafter on the 21st April 2026 I requested a refund, and sent all supporting documents including My account statement from them showing I have a credit balance even added a proof of payment screenshot. refund turnaround time it's 15 days from day of submitting refund request form. I have been following up in the interim while waiting for 15 days, and will only get response after 3 days, I even called them and the guy who assisted mailed them, Today on the 20th May 2026 I receive email from them stating I should send documents in PDF format in order to be refunded, the document were PDF, except Proof of payment sent it was screenshot from my banking app. I was very inconvenienced by Unisa due to the way they handle this query it is unprofessional