Books purchased, only to be informed that it is out of stock and urgently need it for studies

I purchased books for my UNISA Degree studies. My studies are financed through my company and so are my books. I was only able to receive my prescribed book list on Thursday the 11th August 2022, and submitted my order to Wize Books on Sunday the 14 August 2022. Payment reflected in their account on the 17th August, and only then I was informed that the order can only be dispatched on the 29th August. When I enquired about this, i was informed that one of the books were not in stock. This was not originally communicated to me on the website (I have screenshots of this as proof). I was then told that I'm incorrect and that it was mentioned. That night I received another delay on order email that is now postponed to the 2nd September. The total order was R2560. Delivery fee was for free in that order. If I want to split it so that I can at least receive some books, I have to pay delivery fee now. I have assignments due on the 23rd and 24th of August and I Urgently need my books so that I am able to submit my assignments. My company has paid for these books and they are expecting me to properly perform on my studies, but I can't because the provider of my books are withholding it from me. I'm very frustrated with the service received and there is no going the extra mile for the purpose of someone's studies with the provider.