If a review is objectively and materially wrong, the VP of Marketing (if they are competent, this one seems not so much) can usually get an amendment to the review by dropping a friendly note with an explanation of what was wrong. I am speaking from direct experience here.
Pretty much all reviewers, even if they give a negative or mixed review, are not out to destroy anyone out of spite, and care about their credibility to some extent, so will make a correction if it's needed.
Only a grade-A doofus goes straight to legal threats, especially after the Tekton kerfuffle blew up in that guy's face. Even if you have a valid legal case (rare), the best case scenario is you look like a bully and hurt your own reputation more than the reviewer did.