Books I paid for will no longer open on my laptop. Any idea how to get help?

I sometimes read on my Kindle device and sometimes read on my chromebook. I would go to Audible and open books from there and just read. I have a large library and for whatever reason, it is saying I purchased the books but will only give me the sample to read. Ughgghgh. I bought a whole bunch of books because they were slightly lower in price than the hard copies. Total trash. I cannot access any of this content. Anyone else? TOTAL garbage. Amazon CS is a total waste of time. Is there some way to get the content or did they just take the money and run? These were purchases made at the end of 2025 and this year 2026. No idea why they will not let me read the books all of a sudden.