FYI most companies disregard both one and five star ratings. Or one and 10, or basically, both extremes of the spectrum. There's a bunch of reasons why but the TLDR is that they're both lazy ratings and usually don't really mean anything.
If you really want to leave a stain, leave a 2 and make sure to leave a scathing yet detailed reason why. If sufficiently furious, email someone like the director of support at the company and explain what happened. Those people do NOT like getting this kind of stuff and they know well if they receive one, there's probably 100 others that had the same experience but just didn't bother emailing. Can also CC in someone above them to make sure it gets resolved

Ultimately though you are helping them so if you just don't give a shit, I wouldn't give them the courtesy of pointing out their mistakes and instead just change who you do business with.