Report them. It's a known problem and one that they're trying to stamp out. Amazon reviews are beyond salvation imo. Even products with 1star reviews could be great products but the competition writes fake reviews to kill them off. China is the biggest culprit.
Tried reporting them. Turns out, it isn't all that easy.
The first person I spoke to just kept offering me a refund.
The second said they'd forward it to the correct team. Then I got an email asking me for more details, including which operating system I'm running and the error message that I've received(?). I replied and got an answer basically saying "Wrong team, contact CS".
There is a page in the help section about review manipulation, but it just asks people to notify them if they suspect it is happening, with no details as to who should be contacted. I just gave up and took the offer of a refund.