Find the best eSIM for Cuba

I purchased a 30-day plan to give it a try. However, when I followed the connection instructions and scanned the QR code on-site, it showed the message, "This code is invalid." In other words, I couldn't even set up the eSIM to use it. Was I scammed? Since there are no Wi-Fi rental companies that cover Cuba, I finally found this eSIM provider, but I'm extremely disappointed. I don't think I'll ever buy from them again.
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Worst eSim we've ever used and we have travelled a lot and used many different eSims around the world. This was a complete waste of money. Even thought we seemed to be connected to LTE most of the time we couldn't actually download anything, send messages, or surf the web at all.

We couldn't even download the mandatory update to the GigSky app because the connection didn't actually work.