Protea Bookshop, I want answers!!!

I placed an order online on the 6th of Feb 2023. I ordered 10 textbooks worth over R8k. Out of the 10 books, only 8 were delivered. I've not received any comms from them regarding the outstanding books, except for when I went online to review the status of my order. I came to learn that they claim to have delivered 9/10 of the books, which is untrue. I've called them 3 times and have NO one call me back. In fact, I got through the last time. I spoke to someone at 09h00 when they had just opened, only to be told that they had just stepped out. I've emailed them the list of outstanding books and pray that I get an answer. These books don't come cheap, so I can't let this go!